I found an AI image detector. I wasn't sure if a piece was AI because it was so well hidden, but I know there are applications to help identify that sort of thing. So I found an AI image detector and the piece I was suspicious of came back as 78% likely to be AI.
Of course it could be faulty, so I double checked by showing it some of my digital artwork, and it came out as 5% likely. So while its not a lot of evidence, this AI image detector should be useful in filtering out some of the AI crap here. Though it does require you to sign up, albeit for free, but I'm not sure how to actually sign up, because it doesn't think any of my email are valid