But if your city only has one Uber driver, the fact that the data is aggregate is meaningless since it still tells you the exact location data of that one Uber

But if your city only has one Uber driver, the fact that the data is aggregate is meaningless since it still tells you the exact location data of that one Uber driver. I think that's the point that's being made. If you can find a way to make data "aggregate", you can abuse it. How about aggregate data on all Uber drivers named Bill who drive a 2014 beige Camry with a license plate ending in "DEF". Yes technically this could return multiple results, but in practice it's irrelevant.