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I had this idea a few months ago, and found a thread discussing the same thing from several years ago. Seems like nothing came of it.
I currently use Syncthing to keep a lot of items synced across a few of my devices. It's completely decentralized and fully encrypted. Instead of synching files, what if it could be used as an instant messenger? No central server to interrupt service. No single point of attack. No more requiring a name or phone number, just exchange a QR code to begin communicating.
I think this would excel at group messaging, especially if some members are out of service occasionally. Reconnect, and all messages get distributed.
There must be something out there that already works like this, but I don't know of a serverless system.
Skype basically worked like this back in the day. It had it's ups but for day-to-day users it was rather unintuitive so Microsoft moved to a server system when they took it over. I am pretty sure there are still p2p chat systems around though, I just don't know any of them by name.