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The EU proposal to scan all your WhatsApp chats is back on the agenda
(www.techradar.com)
This is a most excellent place for technology news and articles.
Good luck setting up your own server and convincing everybody else to use that.
Signal is not federated. It relies on a central server, meaning for all intends and purposes Signal controls the entire chain.
End to end encrypted, I think chat control is all about client-side scanning so the app being open source is a big deal and would prevent client-side scanning because even if they build in client-side scanning, it's open source and people can remove it.
Just have the server link a hidden device, boom, all chats decrypted.