> Apple has a monopoly on OSes that run iOS apps, OSes that run on iPhones, phones that run iOS and on App Stores that can install iOS apps.
You could also say that Samsung has a monopoly of smartphones with "SAMSUNG" printed on them.
You could also say that Samsung has a monopoly of smartphones with "SAMSUNG" printed on them.
Apple has a monopoly on OSes that run iOS apps, OSes that run on iPhones, phones that run iOS and on App Stores that can install iOS apps.
They abuse all of them (e.g. the Webkit-only issue for iOS, monopoly pricing on iPhones, censorship in App Store).
Conversely e.g. Google has none of these monopolies except for the monopoly in running perfectly apps that require Google Play Services.