As someone who runs a prosody server and also has to maintain accounts on other platforms I really like this. I'm going to keep an eye on this project and maybe at some point in the future once other people have worked out the kinks I'll take a dive into it.

This looks really ambitious and I hope it succeeds. My main concern is that it's swimming upstream against intrenched monopolies guarded by wealthy assholes. And experience has taught me that's not a recipe that leads to interoperability.