hard to put a finger on it, but i do think you should give humanity a little credit... it's actually somewhat easy to spot the "AI" when it does appear in these situations? or maybe i'm just deluded.
I recently discovered how to make very realistic images - you simply ask for your image, then you use the follow-up prompt "make it more realistic" and, most shockingly, it actually works. I never thought of doing it before because it's so stupid.