What I have seen is fundamental confusion iver what "free speech" is.
Generally, it seems people refer to two different things when they talk about free speech.
The first is the negative right to free speech, the basic one most people accept that people have right to speak without threat of violence.
Liberdon is a Mastodon instance for libertarians, ancaps, anarchists, voluntaryists, agorists, etc to sound off without fear of reprisal from jack or zuck. It was created in the wake of the Great Twitter Cullings of 2018, when a number of prominent libertarian accounts were suspended or banned.