[amelius]

> even if they would sell accesss to place an ad to "visitors who have been at this geographic location recently

So if I click on the ad, the company behind it knows I was on that geographic location recently. This is how Google leaks data.

[eitland]

Yep, but that is still on a vastly different scale than what this article is talking about where raw data points are dumped.

I'm not saying that the case you mention isn't problematic but there's still a not the same as being able to follow you around the city.