Signal Fork for bitcoiners
I think Sphinx chat is sort of already that. Granted, they are trying to be everything (social media, patreon, marketplace, messaging) and their marketing is confusing because of that. But it is pretty cool that the messages themselves are sent through the lightning network (not just payments).
But you can’t text people on Signal from Sphinx. So everyone will need to switch to Sphinx and that won’t happen easily until
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you won’t be able to text Signal people when you’re on the monero fork of Signal either
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