It depends how you define the market. If there is one market for phone hardware, and a separate market for app stores, then they’re illegally bundling them and

It depends how you define the market. If there is one market for phone hardware, and a separate market for app stores, then they’re illegally bundling them and using their position in the phone market to anti-competitively win in the app store market. If you define the App Store as a component of the phone (which Microsoft tried to do and failed with their OS and Internet Explorer) then they’re fine.