Sometimes there's an obvious AI comment, how is it auto-hidden/downvoted?
Contrary to popular belief, it's quite easy to spot something written with AI. You just need the skill/gift. I usually spot them rather quickly and will flag on sight. Other users will do the same.
There is some LLM detection for comments that auto-flags them.
It has some unfortunate side effects, though. Namely on a thread where people are discussing a text-heavy post that is LLM-authored, quoting a large enough block of that content appears to trigger it sometimes. Makes sense that it does, but..