What I don't like is the hypocrisy that basically every AI company has engaged in, where copying my shit is OK but copying theirs is not. The Internet is not public domain, as much as Eric Bauman and every AI research team would say otherwise. Even if you don't like copyright[0], you should care about copyleft, because denying valuable creative work to the proprietary world is how you get them to concede. If you can shove that work into an AI and get the benefits of that knowledge without the licensing requirement, then copyleft is useless as a tactic to get the proprietary world to bend the knee.
[0] And I don't.
My opinion is that individual copyright ownership is a bad deal for most artists and we need collective negotiation instead. Even the most copyright-respecting, 'ethical' AI boils down to Adobe dropping a EULA roofie in the Adobe Stock Contributor Agreement that lets them pay you pennies.