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Note AFAIK WA is e2e encrypted BUT they can flag any weird looking messages (weird patterns etc) to see and review their contents.

So I think Meta/WA can opt to decrypt any suspicious messages they come across.

How would that work? Do they send a request to your phone to decrypt it for them?

I'd imagine the app just flags suspicious messages and sends them directly to review, in parallel to sending the encrypted message to the receiver