Your issue is you are defining spyware too broadly. This is not spying on users, but rather 2 companies partnering and sharing data to result in either a better ads system or better understanding on how ads are performing. This is a positive value to society and the commons. Wasting space in a site or app with an ad that won't convert is the true tragedy of the commons. It's a waste of time and money for all parties involved.

Can't you see? We're just trying to build a better cigarette! Flavored to your specific tastes! You'll thank us, you'll see!

No ad has ever converted me yet the ad networks keep showing me ads.