Not for the same reasons - Digg does it for people gaming the system. Here, that kind of thing is exceedingly rare, and HN doesn't ban most of the accounts, it just auto-kills their submissions. HN takes a unique approach to why accounts are banned. If you troll or get into flamefests, pg very often takes time to tell you you're doing poorly (that happened to me last summer). If you keep doing after that, then you get disabled - I think.

It's a system that's very hands-on and it's kept this place scaling really nicely.