I feel like I make this comment a lot, but: how do you know?

You recognize obvious slop as slop. But this is a survivor bias-like phenomenon. You have no idea what goes unnoticed.

If you're talking about stuff posted to communities that are self-selecting for AI art submissions, that's another kind of fallacy.

Because good things are few and far between and it's pretty easy to discern provenance out of band in almost all of those cases.