HN is run by a benevolent dictator for now, I suspect the moment it started shadow-banning or deploy the same sleazy tactics as FB no one would tolerate it here. It would probably go to the oblivion.
HN regularly uses shadowbans, although there's a setting that lets you opt into shadowbanned comments if you really want to see them. The unfortunate reality, as anyone who's tried to run a discussion forum can tell you, is that some users are very dedicated to ruining the quality of discourse and they'll find a way around any attempt to stop them from posting.
