When I see generative AI produced illustrations, they'll usually be at least aesthetically pleasing. But sometimes they are already more than that. I found that there are lots and lots of illustrations that already deliver higher level experiences that go beyond just their quality of aesthetics delivery. They deliver on the goal they were trying to use those aesthetics for to begin with. Whether this is through tedious prompting and "borrowed" illustrational techniques I think is difficult to debate right now, but just based on what I've seen so far of this field and considering my views and definitions, I have absolutely zero doubts that AI will 100% generate artworks that are more and more "legitimately" artful, and that there's no actual hard dividing line one can draw between these and manmade art, and what difference does exist now I'm confident will gradually fade away.
I do not believe that humans are any more special than just the fact that they're human provides to them. Which is ultimately ever-dwindling now it seems.
AI is technically another tool, and it can be used poorly (what people refer to "AI slop", using default settings, some LoRA and calling it a day) and it can be used properly (forcing compositions, editing, fixing errors...) to convey an idea or emotion or tell a story. Critical eye does the rest.
After all, the machine doesn't do anything on its own, it needs a driver. The quality of the output is directly proportional to the operator's amount of passion.
Art stealing is a thing. I've had by art stolen regularly. Multiple Doom mods use sprites I made and only one person (the DRLA guy) asked for permission. I've had my art traced and even used in advertisements with me only finding out by sheer chance. I've had people use it for coloring without crediting the source. This has happened for more than thirty years. You can only learn to live with it, lest you risk going absolutely insane. If you are popular, people will do stupid stuff with your stuff. And if you aren't popular, you art is not going to be used to train, anyway (sets are ordered by popularity and only the top stuff gets used. The one with 3 upvotes is not going in.)