@atomicpoet @goodthinking
email is federated but very few people I know use anything other than gmail. People always raise an eyebrow when I tell them I use protonmail.

I think part of more widespread adoption is maintaining ease of onboarding, and making it as easy as possible for non tech savvy users to host their own instances for communities/friends/family.

Otherwise I wouldn’t be surprised if we’re tooting to those on institutionally hosted mastodon servers.