Nothing to hide yet*. Just because you trust the current government and companies doesn't mean you always will. Data harvested now can be used against you (or your family) in the future. How will these people feel when 20 years from now they are denied medical insurance coverage because they have some data on you that proves you used to consume something that is later proven to cause a medical issue. For example, 50 years ago people didn't know that tobacco caused cancer. How would they feel if that information was used against them? What if just smoking even one cigarette increased their insurance premiums by double? These sorts of things could happen in the future. You never know how laws or economies will change, but one thing is certain: information collected on you now will never be used to your benefit, only to your detriment.