One of the chief concerns about artificial intelligence has long been that it will kill jobs by taking over the work that people currently do. Such fears have been amplified by the exploding interest in generative A.I. tools that can create essays, images, and music via a simple text prompt. OpenAI’s ChatGPT, a buzzy chatbot introduced a few months ago, is the prime example, but there are many more.

So far, workers are not losing their jobs in droves because of such tools. But many fear the day is not far off. Just ask voice actors. Already A.I. tools exist that can make a famous voice seem to say anything with minimal effort by the user. Last month Microsoft researchers showed off a text-to-speech A.I. tool that can simulate anyone’s voice after being fed three seconds of audio of them speaking.

This week, Rest of World, a nonprofit publication that covers technology “beyond the Western bubble,” reported on A.I. dubbing companies hiring voice actors in Latin America to train their algorithms—with an eye toward eventually replacing voice actors like them who are used in commercials, cartoons, movies, news segments, and so on.

But in this case, the loss of jobs isn’t just theoretical. As Rest of World reports, it’s happening. The publication interviewed Argentine voice actor Alejandro Graue, who discovered last month that an A.I.-generated voice had replaced him in a video for a self-improvement YouTube channel for which he’d previously recorded voice-overs.

Graue recalled a technician at the channel telling him that using the A.I. voice is cheaper than paying his rates. Graue fired off an angry tweet directed not at the A.I. technology, but at the voice actors who were helping to train such tools: “Thanks to all the actors and actresses who are lending their voices to create this shit that will eventually render all of us obsolete.”

One of those voice actors who spoke to Rest of World, asking to remain anonymous, described the “marathon” recording sessions in which he participated. “For hours, they make us record a load of words and loose letters in different styles and tones.” Another said they’re asked to sign agreements that will prevent them from claiming any part of a company’s proprietary “voice bank” in the future.

Graue told the publication that he too had been offered gigs training the algorithms in his hometown of Buenos Aires, starting a few months ago. “When they offered me the gig, they told me that I had to record 10,000 words and that they would pay me 10,000 pesos [about $52 at the official exchange rate].”

Among the companies offering A.I. dubbing in Spanish are Tel Aviv-based Deepdub, which focuses on movies and TV shows, and London-based Papercup, which specializes in nonfiction content such as news from the BBC, according to Rest of World.

Of course, voice actors aren’t the only professionals contending with changes to their field brought by A.I.

Editors at the American sci-fi magazine Clarkesworld recently stopped accepting story submissions after discovering that many of those recently submitted by writers had, in fact, been generated by A.I. Some professors are banning the use of ChatGPT in the name of academic integrity, while others are requiring it since they deem knowing how to use A.I. to be an emerging skill. JPMorgan, for its part, recently told employees the use of ChatGPT was off-limits.

The example of Latin American voice actors stands out, perhaps, for how directly workers are being affected, even as other voice actors cooperate with the A.I. dubbing firms putting their future work at risk.

This story was originally featured on Fortune.com

More from Fortune:
5 side hustles where you may earn over $20,000 per year—all while working from home
Millennials’ average net worth: How the nation’s largest working generation stacks up against the rest
Looking for extra cash? Consider a checking account bonus
This is how much money you need to earn annually to comfortably buy a $600,000 home