For new people wondering why Mastodon is on thousands of servers instead of one:
-It helps protect us all against Elon Musk scenarios. It's very difficult for anyone to buy a network made of thousands of independently owned servers. (It's the same reason why no one owns the world's email network, because there are so many independent providers out there.)
-If your server misbehaves (or sells out to a malevolent billionaire), you can move your account to a different server, or even to a brand new server. Decentralisation means you're never trapped on a site you hate.
-Mastodon is an open platform where anyone can start their own server, and they don't need tech knowledge if they use a service like https://masto.host or https://federation.spacebear.ee
...and there are lots more good reasons too, to do with servers using alternative Fediverse software etc, but I'll save that for a future post ????