If someone notices. There's no guarantee that anyone will, even the person doing it. I've certainly done my fair share of verbatim copying -- something I only realised weeks later, if ever.
neither does AI. They don't operate in pixel space, but in latent space, which is the same as a mental model and the neural networks that do this even have a lot in common with how our visual cortex works. The conversion to pixel only happens in the last step when the concept has been generated as mental model (latent representation). They're doing the same thing human designers do, just orders of magnitude faster.
Yes, if you look hard enough you’ll find some. But that’s true on either side.