I don’t think many people have read RFC 5322 (I haven’t), but most non-technical people I know understand these things about email:

• There are different service providers, and people can email each other no matter which provider they use
• There are different email apps
• Some apps are tied to specific service providers and others are not

I do lament the overall level of tech literacy.

The average person understands email pretty well. Mastodon doesn’t require much more understanding than that, but could probably use some UX and messaging work.

That’s a bit of a circular reference: “it got popular because it got popular”. The question remains: why did BlueSky reach that threshold and Mastodon did not?

I’m inclined to agree that’s a problem. Everyone’s first encounter with a social media content recommendation algorithm was one designed to manipulate them into clicking ads, so it caused some backlash. Recommendation algorithms can be tuned to show things people care about and want to engage with.

I’d still echo the (current) top comment’s advice to use something open source, local, and encrypted.

They’ve already taken the hard stance. If they roll it back, they will lose the trust of their users.

Biowink GmbH is probably not a corporation registered under US law. If I had to guess, the government of Germany will not be particularly eager to force them to turn over data to the USA. The Germans take their Datenschutz very seriously.