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Why Signal’s post-quantum makeover is an amazing engineering achievement
(arstechnica.com)
This is a most excellent place for technology news and articles.
they won't do that.
Matrix tried for quite a while to get interoperability, but signal is just too paranoid about distributed hosting or interoperability of their software/protocol. it's quite annoying
And yet simplex exists.
https://simplex.chat/
Wait, simplex isn't paid?
No, it's totally free and open source, and you can host it on your own server if you wish.