It's because Microsoft is way bigger than Apple. 95% of computers run Windows. But as much as I don't like Microsoft, Europeans are idiots. If you do not like your browser you can easily go to Apple's website, Mozilla's website, Google's website, or Opera's website and download a different one! I just put Google Chrome on my mom's computer you don't need a law for browsers this whole thing is BS
That's assuming these people know about their existent. Fact is, a fairly large number of users are content with what's out of the box. They expect electronics to "just work" when they bring it home and hook it up but we all know it can greatly improve if you tweak them. How many know how to tweak their audio system? As daunting as that is to some, so is installing a browser for some.