Halce

To be clear I don’t mean to shit on the platform, I’m just approaching it with a lot of cynicism.

It seemed to me you meant to imply that you, unfortunately, dislike Julian Assange?

associate themselves with Wikileaks and/or Julian Assange

What’s wrong with that?

I assume it should work, but has Misskey federation been tested also? They have a Rust library directly: https://docs.rs/misskey-api/0.2.0/misskey_api/

I assume you could also make Misskey work with direct messages, like you did Pleroma, by linking read:messaging and write:messaging in the API, while Misskey can also do write:page-likes and read:page-likes, which may be of specific interest to Lemmy federaton.

Would it even be possible to encrypt some basic metadata? I doubt that.

If you want, you can try to give the newly released Conduit Matrix server a try, it’s light on resources, so the most basic plan from DigitalOcean, or Vultr would power it just fine.

That said, you’d need to find out how to at least deploy a Docker image onto a server for this to be of any use to you whatsoever.

Using matrix as is out of the box is relatively secure but you need to be aware that a lot of metadata ends up on the servers of a UK based for-profit & venture capital funded company (New Vector).

Using 3rd party clients should really be encouraged.

Matrix probably by default, because most Matrix clients already support E2E out-of-the-gate (Element, Mirage, FluffyChat for iOS, Syphon for Android, KDE NeoChat, nheko). Though you could also have E2E on XMPP, it’d just require more effort to find the appropriate plugins/settings on your part, than with Matrix.