Privacy is Priceless, but Signal is Expensive
signal.org
We estimate that by 2025, Signal will require approximately $50 million dollars a year to operate—and this is very lean compared to other popular messaging apps that don’t respect your privacy.
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Forgive the ignorance but does xmpp have the same features as signal, particularly around e2e encryption?
It's possible to implement XMPP with E2E encryption, there are at least 2 ways to do it.
But of course it only works if both users use a client and server that support it.
Worth mentioning that most modern clients support omemo at this stage.