Factors that set up this report:
1) I'm a mod over on ATF Booru
2) ATF Booru allows AI. Gelbooru does not.
3) ATF Booru has a daily bot that runs and imports the most recent Gelbooru posts tagged with Loli, Shota, or Child.
4) Our site is a clone of Danbooru.
5) Our site has code to automatically check the meta-data of posts and automatically sets the core AI tag if it sees things in the meta-data that indicate a given post is AI. Unfortunately I cannot tell you what it is specifically looking for.
6) We regularly get a handful of posts, imported from Gelbooru, where the AI tags are getting set.

Just got another one today, which prompted this post. I thought that someone from over here might want to look through these AI flagged posts and see if any of them should be removed from over here. The link below is to a search that will give you posts from the import bot that have the AI tag. Are there likely some false positives? Possibly. But IMHO they are worthy of inspection, at the least. Note that, on the linked search, a free account for ATF booru will be needed to see anything NSFW.

booru.allthefallen.moe/po...ter+ai-generated+&z=5

Edit:
Well, I was totally incorrect.

That's not the full truth. We allow AI if it basically doesn't show any ai artifacts/mistakes (multiple fingers etc.), ideally it also should get ai_assisted tags as well but lots of people try to hide that fact on their posts.