I do believe that extremism lends itself to authoritarianism. The deeper you are rooted into your belief structure, the more likely you are to believe everyone else has gotten it wrong, and the more likely you are to think imposing your beliefs on others is in their best interests. The circular model that I proposed is simply a way of highlighting this.
While I am sure this isn’t true of all libertarians, they tend to be ogliarchs (or wannabe ogliarchs) in sheeps clothing. We may have another word for rule by the rich and economically powerful, but I do not think the gap between them and fascists is wide enough to avoid the blanket of “authoritarianism.” I do think libertarianism is an extremist idea that just leads to a different flavour of authoritarianism, thus my point.
Your best bet is to be in a lot of instances. My experiences so far is that basically any singular instance has its bias’, and while some unapologetically ban users for disagreeing with them, the ones that don’t still down vote for disagreeing with them.
While one of these forms of censorship is worse than the other, it’s all censorship, and the only way to see a variety of views is to stay in the varying instances.