>a third party with its own interest You say that as if Google don't have their own interests: encouraging more people to spend on Adwords, sending more clicks

>a third party with its own interest You say that as if Google don't have their own interests: encouraging more people to spend on Adwords, sending more clicks to sites using Adsense, sending more clicks to their own properties, encouraging more people to use Google Analytics. Google don't want to send traffic to your site, they want to sell ads.