If I go to an artist and say "make me a picture with X, Y, and Z features", they own the copyright unless they agree to transfer it to me. An AI tool never owns the copyright to its work because it's not a person, so you cannot acquire the copyright on the work since you didn't generate it.
It's an entirely different process from using Photoshop (&c), and I think conflating them requires either a significant lack of understanding of how AI-based generation tools work (the most common issue) or a deliberate desire to confuse the issue.