To add to this: Many people shrug this off saying they don’t have anything to hide. Even assuming that is true, they usually mean they don’t have anything to hide right now from their current authorities. Ask yourself the question: Is there absolutely no form of government/regime you might want to hide something from? Are you absolutely certain these authorities might not get access to your data? Doesn’t even have to be a possible future government in your own country, it could be in some other country you might want to visit. Or maybe some terrorist organisation who for some reason targets people like you. Is there really absolutely no one you would mind having access to all the data collected about you?
The thing is, the data isn’t going to be uncollected again. The way things are drifting the number of countries not in some way endangered by antidemocratic movements is constantly decreasing. Call me paranoid but I just don’t want to risk it.