The HN guidelines prohibit a lot of behaviors that remain unmoderated, you can see it in any thread that goes over 80 comments.
(Sharing next sentence for the newbies, since you know-) All our jobs to flag on site & even email the worst offenders to hn@ycombinator.com . That said I rarely flag or even downvote anything. People either really behave, or perhaps the rulebreakers break rules that don’t grind my gears. Politely admonishing good faith rulebreakers is another tactic in the arsenal.
AI-generated comment posters with comment histories of exclusively slop get email alerts from me. Don’t know whether they’re planning to sell or spam but they clearly need help finding the door :)