A human artist is a legal person, a GAN is not. That's a fairly substantial legal difference.
If another animal such as chimp draws a human face what do you think would be the outcome? Would a chimp drawing a face be any different to a human drawing a face?
Law is only extremely rarely concerned with only output results and not process, status of actors, etc.
> Would a chimp drawing a face be any different to a human drawing a face?
Yes, legally, the outcome wouldd be different (whether it was original, a direct copy, or something made by copying elements but with some new content) because chimps are neither legal actors that can create a copyright through authorship nor ones who can violate copyright.
See https://en.m.wikipedia.org/wiki/Monkey_selfie_copyright_disp...