The "radical right" enclaves on the internet are literally the only places where you won't be banned for not falling in line.
We need to have this discussion in more than one dimension. Left/right and authoritarian/anarchist are orthogonal metrics.
Donald trump and conservative groups on reddit for example are some of the most ban-heavy groups around. Where are you thinking about?
The only "side" interested in actual free speech currently is the "far right", unlike left leaning forums and media outlets which explicitly censor one particular point of view, regardless of whether it is backed by legitimate science which should be open to discussion.
Censorship has undeniably become a leftist problem, if you insist on reducing the high dimensional space of political leanings to a single myopic dimension. Unbelievable that in 2020 people are shamed for going to the last places on the internet where discourse is unrestricted.
TD, /r/conservative, /r/uncensorednews [1], and all the shitholes on voat have one thing in common, they all ban pretty much anyone who goes against their narratives.
And TD was far right, not as far right as /r/uncensorednews was, but still pretty far right. But perhaps your Overton window is much further to the right than mine (and northern Europe's) is.
[1] The subreddit was banned about two years ago but had 100k+ subs and featured pretty frequent racism, anti-semitism, transphobia, and neo-nazi imagery (the head mod is a self-described neo-nazi after all).