Mac vs PC

Since Apple has complete control over the App Store, no one is surprised that they won't allow Internet Explorer to be used on the iPhone, right?

http://www.crn.com/software/212900396

If Microsoft decided to not allow Safari to be run on Windows Mobile, everyone would be up in arms declaring it unfair business practices.

http://msmobiles.com/news.php/7556.html

Anyone mind explaining the difference?