I'm going to take a wide definition of the word 'art' here and apply it to all artistic methods.

Its not art. Art, almost by definition, partly reflects an emotional state the artist was in when creating the work. AI merely apes the output, not the necessary emotional connection. Its like the shitty music that used to play in lifts (elevators) in that it uses the output but is utterly soulless.

Its ethically way worse than piracy. If you pirate (for example) an ebook or music its more than likely because you want to escape DRM or some other type of controlling software designed to prevent you from actually having control over what you would otherwise have bought. LLM's steal not just that but the whole creative process. Its more than pirating a movie or track or book, its more akin to stealing the thought process from an artists mind and trying to replicate the process automatically.

It is, to me, just another example of making the whole of our international artistic culture a bland homogenized cesspit of crapness. Its capitalism's best way to profit from art as there's no one to pay. But we end of with ever decreasing quality. AI based art becomes like humanity in the matrix - used then liquidised to feed the next iteration.

And then there's also the environmental impact. The last thing the word needs right now is something else gobbling resources - especially when the end result is utter shit.