For a sense of what this looks like in practice consider FurAffinity, which has most of its interesting (read: pornographic) content behind a login wall and I'm to understand fairly aggressive anti-scraping in place due to a history of harassment and strong community sentiment against AI training.

It is probably not surprising to you that the guy with a public domain declaration in bio is more interested in the open platform side of this branch, but I think a sustainable open platform will have to look different now that AI training and inference is part of the ecosystem, Reddit 2 won't work.