If he just wanted kiwifarms to be a gossip forum he could have banned doxxing.

He doesn't allow doxxing out of a commitment to free speech. The forum doesn't actually have that much free speech. If you criticize him you will get banned pretty fast.

There isn't much transparency either. Banned users aren't marked as being banned. And bans are often done without public notification. So unlike most forums, you can't tell if someone has been banned.