AI slop thrives in anonymity. In a community that's developed its own established norms and people who know each other, AI content trying to be passed off as genuine stands out like a sore thumb and is easily eradicated before it gets a chance to take root.
It doesn't have to be invite-only, per se, but it needs to have its own flavor that newcomers can adapt to, and AI slop doesn't.
...and not on Hacker News. Too many pseudo-anonymous jerks, too many throwaways, too much faith placed in gamified moderation tools.