How can we protect ourselves from companies? - eviltoast

This post was shared in many communities a few days ago. What I want to ask is this. If company x sets up a server and the server is really well managed and the majority of users switch to this server, and then this server banishes other servers, the community will be hit. The event leaves the federation and causes the central administration again. What are your thoughts on this? The idea came to my mind to put a user limit on the servers. In this way, if there is a user limit, it seems that a single server cannot grow excessively and centralize. What do you guys think? What are the dangers that await the federation and what measures should be taken against these dangers?