China's biggest apps are inviting the West closer into its insular internet economy

China's insular internet economy shows signs of opening up to foreigners. Cheng Xin/Getty Images China's internet has long been difficult for non-Chinese users to access. But this month, WeChat Pay is integrating PayPal, and content site Bilibili launched an international app. These are signs that China is opening up its famously insular internet economy. For decades, China's internet economy has been a gated-off party. Now, some of its biggest companies are cracking the door open to…