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I like your suggestions, but most people in the world will not go for the *insert some geeky self-sovereign solution that might take more than 30 mins of tinkering.
Privacy should be the default in communication apps.
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then simplex and bitchat for them
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Just use simplex, xmpp on your own server, bitchat and etc. And of course only linux with coreboot/libreboot and real degoogled phones.