You can use any channel to communicate, even gmail or whatsapp. Nobody other than you and person you talk to will be able to see the content
But I dont want to have gmail or whatsapp on my devices.
Have you heard of pegasus?
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You're missing the point. Mentioned earlier apps are only examples. If people used PGP to encrypt messages, they could use absolutly anything
And still have spyware on their devices lol
