This article rises a lot of unanswered questions about how does Google exactly reveal user data to the advertiser. Are they referring to the filters the advertiser used to target the ad and the search keyword, or something more?

> By syncing Google Ads with Callrail, your name and address is tied to your click (and all your other data) when you conduct a certain action on a website that an ad directs to. (Clicking a phone number on the website, for example).

How does Callrail have people's name and address? None of the data relinking the article describes should be made possible by Google and Callrail. If true, this is obviously illegal.