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Matrix and XMPP are not alternatives and are worse for privacy and security
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Simplex Chat is actually is pretty sold but isn’t the most user friendly
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Briar is very cool but its complexity makes it hard to use. It also has problems with real time communications
Matrix and XMPP are not alternatives and are worse for privacy and security
XMPP is exactly as good or bad for privacy as the servers and clients you choose. It’s a protocol, not a service. Unlike Signal, which is a brand/app/service package.