I think it's obvious that AI created art isn't copyrightable based on current law - but the AI prompts are! I think it's interesting to think about what should be done about the situation and how we should analogize it. Is AI like a paintbrush? Is it like a slave? Is it like an elaborate machine? Most artistic output is copywritable regardless of the machinery used to create it, but a slaves art is not copywritable by its master. But a computer program creating art - if it's not AI, is THAT art copywritable?
It's a fun thought exercise.