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This is another reason to only use E2EE FOSS messengers, ever.

You also should be able to host your own server instance and be able to communicate with others on the network (XMPP, Matrix, ...).

Certainly agree with this!

That would not prevent this.

Assuming it's some kind of active censorship and not a bug, how would this be possible with Signal for instance?

E2EE would absolutely 100% prevent this.

Unless filtering happens on the client (see recent Apple news)

That's where the FOSS comes in.