D
There are already several AI-detection tools that exist for internet forum use. Colleges are already using these as well for essays and the like. I have no idea how much they cost or how difficult they are to implement though. The hosting platform here may already have it on the way. Since this is easily the most well-moderated internet forum I have seen, I'm sure that appropriate action will be taken when/if the mods here deem it necessary.
Call the AI police, but quickly, because the forum is broken and transparency is disappearing.