A problem I see is that what someone may consider to be AI-generated actually isn't. And the AI checkers aren't reliable enough to definitely enough say something is AI-generated.
The latest codemaxxed models all tend to write in very distinct, instantly recognizable ways unless carefully instructed otherwise (honestly a good thing if you want to avoid wasting time reading AI text). A great example is this submission that's currently #1 on the front page (which is also just a thinly veiled advertisement): https://news.ycombinator.com/item?id=48884853