Other companies are different: Google is unique in the sense that they have - or if they want, they have enough data to build - an extremely rich and complex profile including very intimate details of a given person.

There is no other company (or a government agency) that knows exactly where you are, how you spend your time, what your precise interests are, what your fears and hopes are (based on your search history), your relationship network, including secret lovers, and so on.

Avoiding being tracked by Google is almost impossible these days, given that everybody uses Gmail, GA, Android and so on.