I think you misunderstood federation. It doesn't make all your data available everywhere, it means that all servers can talk and exchange some data. There is no

I think you misunderstood federation. It doesn't make all your data available everywhere, it means that all servers can talk and exchange some data. There is no reason for servers to hold much userdata outside of what other users have viewed. It also doesn't mean you can sign in wherever. You can't use your email login from live.com to log into the google account, those are two independent credentials. Data also can't migrate freely, it is exchanged freely but not migrated. When I request your account's data, my server requests it from your server. If that server is not available, it can possibly get there via other ways (pushed from other servers along with events, like someone liking the toot). What you might be thinking of is a fully decentralized network, where data is kept like on IPFS. But that's not mastodon. Mastodon offers you a takeout in case you don't trust your instances backups or admin. You can bring that along to a new instance. It does solve the free speech problems of Twitter in that way; if an instance wants to silence you, you're not forced to interact with them, nor can they enforce their moderation rules on you if you don't want to (since you can always move to an instance that agrees with your view on things).