Bloomberg (paywall):

If Google is at fault for its de facto monopoly in Android app stores, Apple should be held to account for a similar violation. Although an Android user can easily shop in a few alternative stores (though none is a match for the Google Play Store), an iPhone user cannot go outside Apple’s App Store without “jailbreaking” the phone, a process that disables operating system updates. That makes Apple a monopoly in the truest sense of the word, and the U.S. Supreme Court has agreed to hear a suit challenging this super-dominant position on behalf of consumers who have no choice but to pay Apple’s 30 percent commission for developers as part of every app’s price.

Like Google, Apple makes its preinstalled browser impossible to delete from a phone. Google, however, allows users to choose their own default applications, including the browser and maps. Apple doesn’t do that; you can, for example, install Google’s Chrome browser and Google Maps on an iPhone, but they won’t launch by default when you click on a link in an email or another app. That’s even more anticompetitive than simply preinstalling one’s own software and hoping users will keep it because it’s good enough.