Whilst there's some valid responses to "I've got nothing to hide" such as "drop your pants", "what's your bank PIN?" etc., there's a lot of people missing out far more insidious examples where privacy is required. e.g. A woman escaping from an abusive relationship will often be in direct danger if her location is given out. Also, consider a whistleblower leaking essential information about wrong-doings at an organisation - they should be able to do so anonymously if their livelihood would be in danger for performing such a public service.

It's a position of privilege to be able to state "nothing to hide" and depends on other people not being racist/sexist/classist etc. It's such a blinkered and sheltered view to hold.