Apple's devices are hugely popular among higher-income individuals, especially in the United States. Benedict Evans has written that there are 650 million iOS devices in active use globally. According to App Annie, roughly 2/3 of mobile application revenues are through the App Store. The other 1/3 is Google Play.
Considering how much consumers have invested in the Apple ecosystem across multiple devices, it's not reasonable to expect that consumers will switch to Android. Apple's customers are locked in.
The question is whether it's OK for Apple to prevent competition within iOS.
If you dislike the ecosystem so much, jump ship to the #1 mobile ecosystem, Android.
What am I missing? Apple popularity in the US is unusually high?