People confuse the desire for privacy from corporate interests with the right to privacy from the government. Google can’t put you in jail, seize your property or execute you. It isn’t whether you think you have anything to hide, it’s whether the prosecuting entity can make a case that you are guilty of something or anything. Remember this most important part of the Miranda warning: Anything you say can and will be used against you in a court of law. (and in a “court of law” is if you’re lucky. The vast majority of criminal cases never see a jury.) That’s “anything you say”, so once you say, “you can look at anything you want going back as far as you want”, you’ve pretty much said that a malevolent (or just seeking job promotion) prosecutor or other entity can do whatever they want with you.