I do think though that any such site or platform will have the issue of judges inflecting their bias in their application of the rules.

So I wouldn't say that it is a unique phenomenon.

That said, of course there is a semantic as well as technical identity to 4chan. And they are quite connected, rather than isolated.

4chan, apart from its lax rules on what we now call hate speech, has developed a community where insults are now part of its culture. The fact that the site is anonymous greatly influences that animosity.

I like to think of 4chan not as a place where horrible people go, but where people go to be horrible. Of course you have the dedicated users, neets or schizos or chronically online, but again that's a propery of every site, and not necessarily a majority.

So if you read /pol/ or /b/ like articles of an organization with an editorial line, sure you will see nazis and a deranged group of people.

If you however see it like bathroom wall writings, you will see a bit of everyone.