Apple has more than enough market share, especially in the US, to dictate what the market does. If it doesn't technically have a monopoly in raw numbers that doesn't mean it should be allowed to get away with some of this shit.
Apple doesn't have >90% market share for iOS app stores? Who is their competition? You can't run an Android app on iOS. There are no iOS apps on Amazon or Google Play. That makes it a separate market.
Saying "your own market" doesn't mean anything. Every monopolist has 100% of their own market. On the other hand, Clorox has 100% of the "Clorox bleach" market.
The question is whether your products and your supposed competitor's products are really the same market. In other words, are your customers the same individuals? Are the products substitutes for one another?
For Clorox bleach and other bleach they are. All bleach is the same, they're perfect substitutes, if the store is out of Clorox bleach and you buy some other bleach you'll never even know the difference.
For iOS app stores and Android app stores, they're completely different markets. The customers for iOS apps are people with iOS devices and the customers for Android apps are people with Android devices -- almost completely disjoint sets of people. If the iOS app store is down, it's infeasible for the average user to get an app from Google Play instead -- they would have to spend hundreds of dollars to buy an Android phone, then replace all of their other apps, just to substitute one app. It would be like saying AT&T didn't have a monopoly in 1970 because you could change carriers by moving to Canada. They're completely different markets.
