The comparisation table between L5 / iOS / Android speaks about decentralized communication. I search the forum for this but could not find any final implementation notes, only ideas or pointers. How is this now implemented?
With Matrix: https://matrix.org/
Matrix is an open source project that publishes the
Matrix open standard for secure, decentralised, real-time communication
I run Dendrite (https://github.com/matrix-org/dendrite) at home, and currently prefer Element (https://element.io/) as client.
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Purism’s Julian Sparber is doing a lot of work on the matrix-rust-sdk and its client, Fractal-next, so we will have good distributed Matrix communication with end-to-end-encryption. To follow his work, see Julian’s blog.
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See also:
Credit where credit’s due, Julian is doing that separately from Purism. But we support him spiritually 
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Why matrix and not xmpp?
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I was asking myself - and here - the same thing about four years before… here are some responses, from the Matrix.org project lead:
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Both matrix and xmpp works right now (nheko and Dino I use). Additionally SIP also works.