I see authors et al claiming it is illegal or infringing to train an LLM on their art analogous to claiming a person is infringing or committing an illegal act by reading or viewing their art.

Asking an LLM to write something in the style of some author amounts to asking a person to parody that author. Asking that same person to produce the original work verbatim is a different matter. And yes, LLMs can certainly be tuned to respect these issues.

I'll end quoting 10cc, Art for Arts Sake, money for God's sake. "gimme a bullet, gimme a smash"