And nobody is claiming copyright to animation in general, only to those animations that were stolen from their authors to train the AI models that are creating animations for you.
Again, if the animations you are generating with them are so simple and generalistic that they couldn't possibly be copyrighted, you should be able to just do them yourself. You aren't doing it, because you aren't able to, because it is nontrivial creative work, and therefor it should be protected by copyright just like any other nontrivial creative work.
So, again: why should this be treated differently and more lightly than stealing other kinds of nontrivial creative work?