Non-privacy advocates say "I haven't got anything to hide. Have you?"
That's the wrong end of the stick. It isn't *what* is known which is the problem, so much as *who* knows it, and whether they have goodwill towards you.
Governments are supposed to have goodwill towards you, but at best, they have indifference. Corporations declare that they have goodwill towards you, but they are lying; they have the same amount of goodwill towards you as a fox has to a chicken.