I warned the other account rather than banning them because, even though they've broken the site guidelines badly on more than one previous occasion, we hadn't warned them before.
We've banned your account because you've broken the site guidelines badly on many occasions and because we've asked you more than once to stop.
If you don't want to be banned, you're welcome to email hn@ycombinator.com and give us reason to believe that you'll follow the rules in the future.
https://news.ycombinator.com/newsguidelines.html