Do people actually self host mail? I remember watching some conference that said it is basically a full time job nowadays to get your mails actually delivered if you’re not one of the big providers. Much easier to pay one of them and just use a custom domain instead, and I can easily see this being a thing for the fediverse one day too (assuming it ever gets big enough)
I wish i could host my own simple lightweight identity provider and authenticator that is used for fediverse instead of creating accounts everywhere. Relying on fediverse to maintain both content, but also account info, seems like a really bad idea in retrospect (even if one day we get proper ways to migrate accounts but not even Mastodon does that well yet).
It’s probably be relatively easy to establish services offering these for less tech savvy people later so they can just have a central identity service with which they can roam around in any fediverse they want later.