There's something that really gets me about this. There was an implicit contract when you signed up for these services: we post stuff, you show it to people, and you can mix in some ads to get a profit. And yeah, we expected you to do some ML shenanigans, but it was all in service of the basic premise of doing a better job at that central contract.
But the expansion of this to training generative AI is a betrayal of that. It has nothing to do with the fundamental premise of social media. In fact, it's actively detrimental. Now when people run out of posts to view, what are you going to do? Show them this generated crap? Have you essentially automated away the freely given labor of making stuff to put between the ads in your advertising service?
What. The. Fuck.