At the moment there's no legal protection for style in an of its self. Additionally there maybe (and should be) if this style-capture actually displaces the artists they're apeing. But I don't see that happening. IMHO its a tempest in a teacup.

Why? Because Ai generated "art" is a soupy mess and real life human artists can speak and understand colloquial language, work quickly, and develop new styles based on new direction.

But then again maybe we're looking at the death of a widespread industry like when gigantic industrial looms came on the scene, but I highly doubt it.

Then again, last of all, I do see a future where AIs generate full feature length photo-real movies in minutes based on prompts and cheaply.