This is excessively reductionist logic. There's a huge gulf between, for example, the snarky reply below ala "forwarding emails is illegal" and "an app is en masse siphoning all communications between its users and others".

The privacy backlash is precisely about people becoming more aware of the latter class of behavior and rebelling against it. Complaining that "no one would be able to do anything" is a straw-man without relevance to the actual social conversation going on right now.