I'm honestly at a loss for why people are so up at arms about OAI using this practice and not Google or Facebook or Microsoft, ect. It really seems we're applying a double standard just because people are a bit pissed at OpenAI for a variety of reasons, or maybe just vaguely mad at the monetary scale of "tech giants"
My 2 cents: I don't think content posted on the open internet (especially content produced by users on a free platform being claimed not by those individuals but by the platforms themselves) should be litigated over, when that information isnt even being reproduced but being used on derivative works. I think it's conceptually similar to an individual reading a library of books to become a writer and charge for the content they produce.
I would think a piracy community would be against platforms claiming ownership over user generated content at all.