Re: So....
But Microsoft didn't get in trouble for forcing Windows to be the de facto desktop OS. They got in trouble for using their (fairly won) OS monopoly to try to create a second monopoly.
The situation with Google is pretty much identical. Their search monopoly is legitimate and no-one is saying otherwise. The issue comes from using that search monopoly to push other products. You can argue that it's trivial for users to go to other price comparison sites but the truth is no-one bothers because there's a big shopping button right at the top of any Google search.
Should Google be punished because users are a bit lazy? Possibly not but it's exactly the same rationale behing Microsoft's fines over the browser wars.