> Moreover, the advantages go beyond margins: the best way to understand both Apple’s profits and many of its choices is to understand that the company has a monopoly on not just MacOS but even more importantly iOS. That means Apple can not only capture consumer surplus on hardware, but developer surplus when it comes to app sales; that some apps are not made is deadweight loss that Apple has chosen to bear to ensure total control.
The problem that Apple is having in China is that WeChat is the driving "platform" ecosystem, not the OS or the brand.
In other words, people aren't buying iPhones for its integration with Apple services in China, which could lead to an increase in growth due to the halo effects. Instead, they run WeChat and they buy things through there, which leads to no growth in Apple's services and revenue. Which also means, the customers have no desire to buy another Apple device. They can do the same on any device that can run WeChat.
If Microsoft sells a Windows Phone with WeChat as the default app for everything, they may have a hit in China but it would not be a sustainable hit because again, WeChat can run on iPhone or Android or any other OS.