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We use WhatsApp, which I don't really trust but if I'm sharing a picture to my family I don't expect each member to keep it in a vault.

Have you considered using Signal instead of WhatsApp for secure messaging?

Yes, and also Matrix. But WhatsApp is very popular in my family's country and everyone was already using it.

Why do people trust signal isn't it as black box as everything else? Or did they add reproduceable builds already?

Encryption on Signal is all client side, the server can't see the plain text, says Signal.

say WhatsApp too