Most people don't realize WHY google started to build their own web browser in the first place. It was actually because of google docs. Google wanted to dominate the office software sector, and Microsoft didn't let them on Windows. Therefore Google had to change the platform - to the web.
Regarding ad networks: google analytics is used among around 84.1% of websites. If that is not a monopoly, then I don't know what is. The rest is like a couple of pedestrians on the street that don't have a car already.
I mean, you cannot justify that this should be allowed. Not a single country on the planet should have access to THAT much data, and much less a single company without any moral obligations because they don't even pay taxes in the countries they are operating in.