There was dozens of p2p messengers in the early-mid 2000s which were private, decentralized and secure, did we literally lose all that tech or are some of them still functional?
You mean like AIM, ICQ, and Jabber?
Jabber at least is still around, but hardly anyone uses it.
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I forgot you wrote the "decentralized" part so really that only leaves Jabber.
Jabber/XMPP was one of of them, but there were a ton of them based around a P2P architecture. I don't remember names unfortunately.
