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this is implemented in a way that forces all existing messaging services to implement this or shut down
This is not possible. Anybody can host a messaging service as a tor onion, and there is nothing they can do about it :)
The only way they can make it work is to basically only allow connections to whitelisted services (not even GFW does that).
I don’t use it either, but wikipedia (and common knowledge) suggests they do like censoring everything https://en.wikipedia.org/wiki/Censorship_by_Facebook