Given the number of labs that are competing these days on "open weights" and "transparency" I'd be very interested to read details of how some of them are handling the human side of their model training.
I'm puzzled at how little information I've been able to find.
Time Exclusive: OpenAI Used Kenyan Workers on Less Than $2 Per Hour to Make ChatGPT Less Toxic
https://time.com/6247678/openai-chatgpt-kenya-workers/
Beyond that, I think the reason you haven't heard more about it is that it happens in developing countries, so western media doesn't care much, and also because big AI companies work hard to distance themselves from it. They'll never be the ones directly employing these AI sweatshop works, it's all contracted out.
https://nymag.com/intelligencer/article/ai-artificial-intell...
unwalled: https://archive.ph/Z6t35
Generally seems similar today just on a bigger Scale. And much more focus on coding
Here in the US DataAnnotation seems to be the most marketed company offering these jobs