Why did Apple not give up China's WeChat?

This is undoubtedly, Apple did not dare to take the WeChat, at least not now, we may know, WeChat registered users have more than 700 million, covering the world, where there are Chinese WeChat, we can also see that weChat Powerful, has not only our people's communication tools, and now each country has its own WeChat account, for the convenience of a; we all know, China is a big customer of Apple, a new machine each year we can see But in recent years we have also heard a lot of news that boycott Apple, but some small partners still under pressure to buy Apple, but WeChat shelves in Apple, I believe these people can buy Apple as " Patriotic ", give up the apple.
WeChat seems to have become the core tool of a mobile phone now. Telephone, file transfer, voice and video, and circle of friends are all indispensable to our daily life. Therefore, no WeChat and Apple are almost the same.