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By design, end-to-end-encrypting #deltachat and #webxdc apps only need ephemeral transport. It's a big deal. Let's compare:

- #matrix home servers maintain a cryptographic forever-chain of cleartext social-graph metadata.

- #WhatsApp servers maintain cleartext metadata visible to Meta.

- #Signal keeps encrypted metadata, hosted at GAFAM

#chatmail relays do not persist any social graph state, also not in encrypted form. A key goal of our designs: chatmail operators can sleep well at night :)