>>dredmo+1
But the premise is just bad law. Disney does, in fact, hold a copyright on the Mickey Mouse character (at least until the end of 2023) [1]. It doesn't matter where the art comes from. Anyone making copies of something with Mickey Mouse in it -- whether drawn by a Disney artist, or drawn by someone else, or "drawn" by an AI -- is violating their copyright (at least for another year).
On the other hand, nobody owns a copyright on a specific style. If I go study how to make art in the style of my favorite artist, that artist has no standing to sue me for making art in their style. So why would they have standing to sue for art generated by an AI which is capable of making art in their style?
[1] https://fishstewip.com/mickey-mouse-copyright-expires-at-the...