Late night food for thought...
Think of Mastodon social media the same way you think about email.
What if schools, governments and companies had there own instances? Mastodon could replace how email is used in many environments and could become a default communication method for group interactions. You'd have your work masto and your personal masto, just like email. Every entity would own its own data.
@mastodonmigration @doctorpepper you are already reading a toot from a user who is on another server. Yours is @mastodonapp.uk, you answered on a thread started from a user on @mastodon.online and I answer you from @qoto.org