One way it leaks is that an advertiser generally knows what ad campaign a user clicked on. So if that ad campaign was only sent to a particular location, you know where the user was when they clicked on the ad.

These advertiser websites know your city already by the act of you visiting their website.

"You can choose one of the default radius settings or set a custom radius from a minimum of 1 km to a maximum of 1,000 km."

https://support.google.com/richmedia/answer/7279179?hl=en&re...

Knowing that someone in 6,000 people in an area clicked on your coffee ad is not leaking GPS data. Which is probably why bounty hunters are buying the data directly from cell carriers and not running targeted Google ads.

It's also not "one in 6,000 people" if it's someone who signs up for some service via the ad. That particular someone might not realize that the service knows their location.

The point in 1:6,000 is that whether it's ad targeting or just regular internet traffic, there isnt enough specificity to "leak" data about the person.

You can split hairs over, "Well what of they join that 1:6000 with other PII" and it's the same with Geo IP. The user gives up that data but it's not different than just visit the page normally.

I'm confused by your reference to me and my concerns. This isn't a discussion about me; I was making a point about leakage of location information.