But I will do it where I see egregious misconduct in others' threads.
As for unpaid moderation ... I've various reasons for misgivings about HN (as I do about virtually all of the Internet these days), but the site's given me value, seems to spill out positive externalities all over the place, and, well, is reasonably well moderated, all told. It's certainly not turned to shit as so much else has, even if it does frequently disappoint in other regards.
But when it's good, it is in fact pretty darned good.