I can't say for HN, but the general answer is yes. Social systems tend to produce a lot of novel behavior, with plenty of surprising second- and third-order effects. Dealing with jerks, trolls, griefers, etc, is an arms race; they're always looking for new ways to mess things up. And the tools in this space are constantly evolving, too; for example, there's a lot of interesting ML work being done for automated content tagging.
>>wpietr+(OP)
Plus the content here is generally of intrinsic interest, and the commentary / community of sufficient quality that working in its active defense likely carries some of its own reward in the doing.