There are good reasons why the Fediverse is on so many servers:
-It prevents Musk (or anyone!) from buying the network
-If a server is badly run, you can move to another without losing your followers
-Far more human admins on the Fediverse, moderation tends to be better
-If one server goes down, the others still work
-Each server makes its own rules
-Anyone can set up a server
-Lots of server types to choose from, and they connect to each other
More details at https://fedi.tips/why-is-the-fediverse-on-so-many-separate-servers/