Not sure what you are talking about. I can sign up for mastodon right now with a hundred different servers.
Yes, people might be expecting a single corporate entity called "Mastodon, Inc," but that's why the (very poor) analogy to email is bandied about. You have to pick a service provider in order to use email (Gmail, Yahoo, Hotmail, etc), and you have to pick a service provider in order to use mastodon, too.
Twitter, Inc, is the single provider of the twitter service, but that's falling apart because there's no way for the twitter service to route around the damage being done by Twitter, Inc's new owner.
Yes, people might be expecting a single corporate entity called "Mastodon, Inc," but that's why the (very poor) analogy to email is bandied about. You have to pick a service provider in order to use email (Gmail, Yahoo, Hotmail, etc), and you have to pick a service provider in order to use mastodon, too.
Twitter, Inc, is the single provider of the twitter service, but that's falling apart because there's no way for the twitter service to route around the damage being done by Twitter, Inc's new owner.