I mean hey, by all means if you think a community is too hive mind-y or echo chamber-y then by all means don’t join. That’s the beauty of small highly customized communities - it can be moderated in a way all the members agree with, and anyone who doesn’t like it can find or found a different one.
I don’t know what exactly you’re imagining such a community would disallow, but I feel like whatever it is, I’d agree with it being disallowed. Disagreeing with someone is typically fine in most communities I’ve seen, it’s just hate speech or any -ism or -phobes that aren’t. And that’s fine.
I’m not sure I agree with the take that blahaj.zone has a facism problem. They’re explicitly anti-tankie and anti-nazi, which are the authoritarian end of the political spectrum. It’s a very left leaning space, and I think anyone in the lower left quadrant, e.g. libertarianism to anarchism and socialism to communism, would be well received.