Humans detect mode collapse. If there was one artist making art in the style of AI (by hand), he'd be no more annoying than say Reg Mombassa, Guy Delisle or Tony DiTerlizzi or anyone else drawing in an idiosyncratic, easy to recognize way.
There's an insane amount of fine-tunes out there (be it base models or LoRAs), that drastically vary in styles they produce. "AI" art can look very different, and I still think the only common property to it is sloppiness, lack of intentional attention to the fine details.