This article first appeared in The Checkup, MIT Technology Review’s weekly biotech newsletter. To receive it in your inbox every Thursday, and read articles like this first, sign up here.

Over the past couple of weeks, I’ve been speaking to people who have lost their voices. Both Joyce Esser, who lives in the UK, and Jules Rodriguez, who lives in Miami, Florida, have forms of motor neuron disease—a class of progressive disorders that result in the gradual loss of the ability to move and control muscles.

It’s a crushing diagnosis for everyone involved. Jules’s wife, Maria, told me that once it was official, she and Jules left the doctor’s office gripping each other in floods of tears. Their lives were turned upside down. Four and a half years later, Jules cannot move his limbs, and a tracheostomy has left him unable to speak.

“To say this diagnosis has been devastating is an understatement,” says Joyce, who has bulbar MND—she can still move her limbs but struggles to speak and swallow. “Losing my voice has been a massive deal for me because it’s such a big part of who I am.”

AI is bringing back those lost voices. Both Jules and Joyce have fed an AI tool built by ElevenLabs recordings of their old voices to re-create them. Today, they can “speak” in their old voices by typing sentences into devices, selecting letters by hand or eye gaze. It’s been a remarkable and extremely emotional experience for them—both thought they’d lost their voices for good.

But speaking through a device has limitations. It’s slow, and it doesn’t sound completely natural. And, strangely, users might be limited in what they’re allowed to say.

Joyce doesn’t use her voice clone all that often. She finds it impractical for everyday conversations. But she does like to hear her old voice and will use it on occasion. One such occasion was when she was waiting for her husband, Paul, to get ready to go out.

Joyce typed a message for her voice clone to read out: “Come on, Hunnie, get your arse in gear!!” She then added: “I’d better get my knickers on too!!!”

“The next day I got a warning from ElevenLabs that I was using inappropriate language and not to do it again!!!” Joyce told me via email (we communicated with a combination of email, speech, text-to-voice tools, and a writing board). She wasn’t sure what had been inappropriate, exactly. It’s not as though she’d used any especially vile language—just, as she puts it, “normal British banter between a couple getting ready to go out.”

Joyce assumed that one of the words she’d used had been automatically flagged up by “the prudish American computer,” and that once someone from the ElevenLabs team had assessed the warning, it would be dismissed.

“Well, apparently not, because the next day a human banned me!!!!” says Joyce. She says she felt mortified. “I’d just got my voice back and now they’d taken it away from me … and only two days after I’d done a presentation to my local MND group telling them how amazing ElevenLabs were.”

Joyce contacted ElevenLabs, who apologized and reinstated her account. But it’s still not clear why she was banned in the first place. When I first asked Sophia Noel, a company representative, about the incident, she directed me to the company’s prohibited use policy.

There are rules against threatening child safety, engaging in illegal behavior, providing medical advice, impersonating others, interfering with elections, and more. But there’s nothing specifically about inappropriate language. I asked Noel about this, and she said that Joyce’s remark was most likely interpreted as a threat.

ElevenLabs’ terms of use state that the company does not have any obligation to screen, edit, or monitor content but add that it may “terminate or suspend” access to its services when content is “reasonably likely, in our sole determination, to violate applicable law or [the user] Terms.” ElevenLabs has a moderation tool that “screens content to ensure it aligns with our Terms of Service,” says Dustin Blank, head of partnerships at the company.

The question is: Should companies be screening the language of people with motor neuron disease?

After all, that’s not how other communication devices for people with this condition work. People with MND are usually advised to “bank” their voices as soon as they can—to record set phrases that can be used to create a synthetic voice that sounds a bit like them, albeit a somewhat robotic-sounding version. (Jules recently joked that his sounded like “a Daft Punk song at quarter speed.”)

Banked voices aren’t subject to the same scrutiny, says Joyce’s husband, Paul. “Joyce was told … you can put whatever [language] you want in there,” he says. Voice banking wasn’t an option for Joyce, whose speech had already deteriorated by the time she was diagnosed with MND. Jules did bank his voice but doesn’t tend to use it, because the voice clone sounds so much better. 

Joyce doesn’t hold a grudge—and her experience is far from universal. Jules uses the same technology, but he hasn’t received any warnings about his language—even though a comedy routine he performs using his voice clone contains plenty of curse words, says his wife, Maria. He opened a recent set by yelling “Fuck you guys!” at the audience—his way of ensuring they don’t give him any pity laughs, he joked. That comedy set is even promoted on the ElevenLabs website.

Blank says language like that used by Joyce is no longer restricted. “There is no specific swear ban that I know of,” says Noel. That’s just as well. 

“People living with MND should be able to say whatever is on their mind, even swearing,” says Richard Cave of the MND Association in the UK, who helps people with MND set up their voice clones. “There’s plenty to swear about.”

Now read the rest of The Checkup

Read more from MIT Technology Review’s archive

You can read more about how voice clones are re-creating the voices of people with motor neuron disease in this story.

Researchers are working to create realistic avatars of people with strokes and amyotrophic lateral sclerosis that can be controlled via a brain implant. Last year, two such individuals were able to use these devices to speak at a rate of around 60 to 70 words per minute—half the rate of typical speech, but more than four times faster than had previously been achieved using a similar approach. 

Other people with ALS who are locked in—completely paralyzed but cognitively able—have used brain implants to communicate, too. A few years ago, a man in Germany used such a device to ask for massages and beer, and to tell his son he loved him. 

Several companies are working on creating hyperrealistic avatars. Don’t call them deepfakes— they prefer to think of them as “synthetic media,” writes my former colleague Melissa Heikkilä, who created her own avatar with the company Synthesia.

ElevenLabs’ tool can be used to create “humanlike speech” in 32 languages. Meta is building a model that can translate over 100 languages into 36 other languages.

From around the web

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Cats might have spread bird flu to humans—and vice versa. That’s according to data from the US Centers for Disease Control and Prevention, which published the finding but then abruptly removed it. (The New York Times)

And a dairy worker is confirmed to have been infected with a second strain of bird flu that more recently spilled over from birds to cows. The person’s only symptom was conjunctivitis. (Ars Technica)

Health officials in states with abortion bans are claiming that either few or zero abortions are taking place. The claims are “ludicrous,” according to doctors in those states. (KFF Health News)

A judge in the UK has warned women against accepting sperm donations from a man who claims to have fathered more than 180 children in several countries. Robert Charles Albon, who calls himself Joe Donor, has subjected a female couple to a “nightmare” of controlling behavior, the judge said. (The Guardian)

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At the 2025 CCTV New Year Gala last month, a televised spectacle watched by over a billion viewers in China, 16 humanoid robots took the stage. Clad in vibrant floral print jackets, they took part in a signature element of northeastern China’s Yangko dance, twirling red handkerchiefs in unison with human dancers. But the robots weren’t designed by their maker, Unitree, for this purpose. They were developed for general use, and they are already at work in China’s EV sector.

As the electric-vehicle war in China calms down, leaving a few established players to dominate the field, Chinese EV giants are expanding into humanoid robotics. The shift is driven by financial necessity, but also by the advantages these companies command in the new sector: strong existing supply chains and years of experience building cutting-edge tech. 

Robots like the H1 that performed at the gala have moved into Chinese EV factories thanks to partnerships between Unitree and EV makers like BYD and XPeng. But now, China’s EV companies are not just using these humanoid robots—they’re building them. GAC Group, a state-owned carmaker, has developed the GoMate robot  to install wires in cars on its production line. The company plans to mass-produce GoMate by 2026 for use in factories and warehouses. Nio, an EV startup known for its battery-swap network, has partnered with the robot maker UBTech on top of forming its own in-house R&D team to build humanoid robots.

According to statistics from Shenzhen New Strategy Media’s Industrial Research Institute, there were over 160 humanoid-robot manufacturers worldwide as of June 2024, of which more than 60 were in China, more than 30 in the United States, and about 40 in Europe. In addition to having the largest number of manufacturers, China stands out for the way its EV sector is backing most of these robotics companies.

Thanks in part to substantial government subsidies and concerted efforts from the tech sector, China has emerged as the world’s largest EV market and manufacturer. In 2024, 54% of cars sold in China were electric or hybrid, compared with 8% in the US. China also became the first nation to reach an annual production of 10 million “new energy vehicles” (NEVs), a category that includes all vehicles powered partly or entirely by electricity.

The EV companies that achieved this remarkable growth have amassed significant capital, technological capacity, and industry prestige. Leading firms like Li Auto, XPeng, and Nio—each founded roughly a decade ago—have become household names. Traditional manufacturers that have transitioned to EV production, such as BYD and Geely, have also emerged as major players in the tech world, thanks to their engineering skills and the AI-powered driving features they’ve introduced. 

However, despite the EV market’s rapid expansion, industry profit margins have been on a downward trajectory. From 2018 to 2023, the number of NEV companies plummeted from over 480 to approximately 40, owing to a combination of consolidation and bankruptcy. Data from China’s National Bureau of Statistics indicates that since 2021, profit margins in China’s automotive sector have declined from 6.1% to 4.6%. Last year also saw many Chinese EV companies do rounds of large-scale layoffs. Intense price and technology wars have ensued, with companies like BYD offering advanced autonomous-driving features in increasingly affordable models.

The fierce competition has created a pressing need for new avenues of financing and growth. “This situation compels automakers to seek cost reductions while crafting narratives that bolster investor confidence—both of which are driving them toward humanoid robotics,” says Yao Jia, a robotics researcher at Aegon Industrial Fund.

Technological overlap is a significant factor driving EV companies into the robotics arena. Both fields rely on capabilities like environmental perception and interaction, using sensors and algorithms that can process external information to guide machine movements. 

Lidar and depth cameras, initially developed for autonomous driving, are now being repurposed for robotics. XPeng’s Iron robot uses the same path-planning and object-recognition algorithms as its EVs, enabling precise navigation in factory environments.

Battery technology is another crossover area. GAC’s GoMate robot uses EV-derived battery packs to achieve a six-hour run time, making it suitable for extended factory shifts.

China’s extensive supply chain infrastructure supports these developments. According to a report by Morgan Stanley, China controls 63% of the key companies in the global supply chain for humanoid-robot components, particularly in actuator parts and rare earth processing. This dominance enables Chinese manufacturers to produce humanoid robots at lower prices than their international competitors. Unitree’s H1 is priced at $90,000—less than half the cost of Boston Dynamics’ Atlas, a comparable model.

“The supply chain advantage could give China an upper hand when the robots hit the point of mass manufacturing,” says Yao.

However, challenges persist in areas like artificial intelligence and chip development, which are still dominated by companies beyond China’s borders, such as Nvidia, TSMC, Palantir, and Qualcomm. “Domestic humanoid-robot research largely focuses on hardware and application scenarios. Compared to international counterparts, I feel there is insufficient attention to the maturity and reliability of control software,” says Jiayi Wang, a researcher at the Beijing Institute for General Artificial Intelligence.

In the meantime, the Chinese government is promoting automation through initiatives like the Robotics+ action plan, which aims to double the country’s manufacturing robot density by 2025 relative to 2020 levels. Additionally, some provincial governments are offering research and development subsidies covering up to 30% of project costs to encourage innovation in automation technologies. It’s becoming clear that China is now committed to becoming a global leader in robotics and automation, just as it did with EVs.

Wang Xingxing, the CEO of Unitree Robots, said this well in a recent interview to local media: “Robotics is where EVs were a decade ago—a trillion-yuan battlefield waiting to be claimed.” 

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Hotstar and JioCinema, two widely used video streaming apps in India, have merged into JioHotstar. JioStar, a joint venture between Reliance-owned Viacom18 and Star India, said Friday it had integrated JioCinema’s vast library of content into a revamped version of Disney’s Hotstar platform. The merged app, live as of early Friday local India time, will […]

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Turo on Thursday withdrew its plans for an IPO, ending a three-year wait to bring the online car-sharing network to the public marketplace, according to a regulatory filing. Turo, which was founded in 2010, allows private car owners to rent out their vehicles through the startup’s website or app. The company — sometimes described as […]

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