So, uh. What about Lemmy?

They can also crawl this publically-accessible social media source for their data sets.

I’m on board with abandoning mainstream social media, but my point is that your suggestion would not solve the problem just relocate it. A better solution to the AI conglomerates stealing everyone’s data from the open Internet is legislation and regulations - ie tackling the whole ‘stealing data’ component, along with stronger privacy regulations for everyone to make it harder for them to do the same in the future. It’s nice seeing the EU taking some positive steps, but we will not see the US take any steps in that direction anytime soon, due to corporate capture of their politicians and the AI companies all being in the top 10 most wealthy companies in the US.