Courts pretty much always rule in favor of rich corps that steal from individuals, and increasingly so. AI companies have money. Artists don't. That makes AI thievery fine, doubly so since AI corps have financially contributed to the government.
No one is stealing anything. It's not theft. There has been no crime. None of this is anywhere near criminal law.
I could make a more nuanced argument on copyright infringement. But to make that steelman, I'd need to accept a too large overton window shift, so I'll decline to do so here.
The problem is that you're putting it in the wrong legal framing, and it just won't fly. Willing to engage, but not on these terms.
Music conglomerates have money and their lawsuits will probably settle the issue.(unless they settle) That will be applied for all copyrighted works, regardless of the medium.
I believe going against the big guys is the reason why the big ones don't yet have music generation LLMs.