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Re:End-to-End Encryption and Messaging Interoperability by mr90210 on Sunday April 17, 2022 @08:48AM (#31060480)
A few months ago I had thought about this topic, what I had in mind was some sort of protocol for Messaging which Messaging Apps could agree to adhere, thus making interoperability possible.

As the article says, that’s not a trivial problem, nor do these apps have the incentive to adhere to such solution unless they are a new player.

Re:End-to-End Encryption and Messaging Interoperability by bilal4hmed on Sunday April 17, 2022 @09:13AM (#31060599)
For the protocol Matrix would be a good fit but all the other points you mention are valid. Its not trivial and there is no incentive.