> No, everybody needs to give up their privacy "for the greater good"

You can bargain (via voting) about how much of the stuff you need to forgo. But you can't have 100% privacy, if the nation has to function.

You don't need to give up any privacy at all, if you don't expect anything from government. But the concept of a nation is hinged upon it's citizens foregoing a bit of privacy, a bit of their income, a bit of their freedom. The nation imposes rules that you need to follow (loss of freedom), asks you to pay up taxes and makes your identity linked to the citizen services.

The nation comes into existences precisely from the things that you forego.