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Israel is killing people based on being in the same Whatsapp group
(blog.paulbiggar.com)
A community for Lemmy users interested in privacy
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This is why metadata matters so much. Plenty of "end-to-end encrypted" apps only handle the content of messages, but know on the server side what people are in what places. Or even keep a historical record of who joined and left. Or just don't bother encrypting...
There is functionally no way to hide this kind of information from a state actor short of some onion routing scheme mesh networking.
Signal does a decent job just out of the box.