On the other hand, I'm not sure that it won't just make things worse, since not everyone is going to respond as well as you might to a message like "Your account has been rate limited."
Something I note having been caught up on both sides of this issue: as moderator and moderated.
HN itself is not one of the super-sites, but it is amongst the better discussion platforms on the internet here and now (boys), and has been for far longer than virtually any other instance I can think of (dating to 2007). Metafilter would be the principle other exemplar.
Usenet, Slashdot, Kuro5hin, Google+, Reddit, Ello, Diaspora*, Imzy, FB, Birdsite, and others, would be amongst the failures IMO. Not all are now defunct (though about half that list are), none remain usable.