Earlier quoted context omitted.
No one controls Mastodon -- setup an instance and you're off to the races!
The idea of preemptive banning of federating with other instances is extremely common in Mastodon-land. This means that unilateral actions by admins, invisible to their userbase, restrict what their users can read, or who can read their users. It would be fine if the users opted into this, but it happens silently and arbitrarily by admins, oftentimes based on speculation or gossip, not even real abuse. It’s all of th…
Why does it matter if any instance decides they don't want to associate with you? It doesn't affect your ability to use the service beyond not being able to interact with folks who probably don't want to talk to you anyway.
Forcing someone to make their server software talk to yours is just as much of a "Free Speech" infringement, if not moreso.