In my opinion, AI generated output should be copyrightable as long as, and only if, the person using AI prompted it to generate the output based on an idea they originally had. If the idea itself was AI generated, I don't think it deserves copyright. But if the idea was original and AI was just used as a system to do the heavy lifting (coding etc.), then I don't see an issue with being able to copyright the output. This is just my opinion.