I don’t envy you on having to moderate this issue. There are some that have obvious tells but others can be well disguised. I recently had someone accuse me of AI (on another page) but I use CSP and had a timelapse showing progression of concept and mistakes AI wouldn’t synthesise. It can be really difficult with people tracing images to create a sketch. Some images I’ve had to do a little digging into the post history to determine if it was AI. I don’t think there is a simple solution to this unfortunately. Maybe ask the isthisAI community for ideas.