Thanks for the ad hominem. Subjective artistic value aside, do you not dispute that prompting AI to create an artistic image is functionally the same as outsourcing to another human? You input instructions and a commission fee; you get back a piece of artistic expression. You did not create the art, someone else did. And for AI output, the machine cannot claim a copyright on that original image.
If you outsource the image creation, then throw it on a t-shirt design, or modify it, or do whatever, you can copyright the modified work that you Han a hand in creating, but you still are not the creator of the original.