As far as I know, there have been no compromises. The fact that you might find out that the average number of rooms in my census tract is 8.4 doesn't tell you how many rooms are in my house, since there are 7,900 other people living there.
So as far as I'm concerned, invasion of privacy is not generated when we provide aggregate information about groups of people. Privacy is invaded only when an individual's details are publicized, and I don't believe that has ever happened.