"and others could do nothing about that. The possibilities are endless."
Well, I wouldn't be so sure about it. Just because other people have no more copyright legal angle, there are still other legal and plenty of non legal ways to bother you, if you manage to piss enough people off.
Well yeah, but that's just being part of this universe and applicable to anything.
If one were to write fanfic with all those things combined, legally there are no repercussions, but people have indeed been tried and burned for less.
Imagine all the weird generative AI now these works all go public. Don't have to like it, but just imagine. So much crap will be produced in 2026.