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Re:Attorney General will ask Zuckerberg to halt plans for en... by dualboot on Thursday October 03, 2019 @06:03PM (#21152735)
Signal is pretty solid.

https://signal.org/

Re:Attorney General will ask Zuckerberg to halt plans for en... by greyfade on Thursday October 03, 2019 @06:24PM (#21152909)
Maybe it is, but it's not the decentralized replacement for Discord and Teams that I envision.
Re:Attorney General will ask Zuckerberg to halt plans for en... by cyphar on Friday October 04, 2019 @04:51AM (#21155934)
I would take a look at Matrix[1], which is basically what you're describing (it's a federated replacement from group chats that has Signal-like E2EE and has an open protocol) and it's already implemented.

[1]: https://matrix.org/