Likely because the intended audience is not people who see it as a viable alternative or something worth even entertaining. The irony of the situation being someone took the time to make their own platform for like minded individuals, and people in other spaces who've been known to tow the "you're free to make your own platform" line get extraordinarily bent out of sort when people actusally go and do just that.

The hilarious part being that by having the censorship in the first place and not just letting folks work it out amongst themselves, you just increase the echo chamber factor, which at some point, you have to come to terms with in real life on the basis these people exist in the real world. The very act of technically enforced societal marginalization in and of itself is an "extremism" amplifier/polarization catalyst. What confuses me is why I feel like I'm the only one who regularly brings it up. It's not that hard of a realization to reach From first principles. Especially if you spent any time in your life as a social misfit.