> If you use an AI, there isn't.
What is the functional difference here? You are commissioning (see: prompting) someone (see: an AI) for a piece of work, or artwork or whatever. The output is out of your control; and I don't think the existence or lack thereof of a human on the other end materially matters.
If we had hyper-advanced ovens from The Jetsons where we could type a prompt using a fold-out keyboard and it would magically generate whatever cake we ask of it: did we or did we not bake that cake? And I do not think it is clear the author put a lot of work iterating and shaping it into what he wanted; we have zero insight into that.
If we had a complete black box where you submitted Prompt and out came Thing, and you had zero clue what said black box actually did, could you claim creation over Thing? What does knowing that it's a human vs LLM make materially different in terms of whether or not you created it?