While I understand your point, and think it's a valid privacy concern, the reasoning about leaking info on all of Google's users doesn't make sense. If I install a security camera in my room, I'm not leaking information about you if it shows you're not here. There was no expectation of the possibility of that in the first place, so no information is leaked. This is only leaking information about the Google users who are reasonably likely to be within the radius where the query is executed. So perhaps a couple thousand users, (so a legit privacy concern) but not all of them.