1) Most non-Chinese apps are already banned in China.
2) The world trusts US companies because unlike China the US is not a dictatorship, has a functioning, independent judiciary and generally abides by international law. So there is a far greater level of trust there because there are legal mechanisms to prevent breaches.
2) The world trusts US companies because unlike China the US is not a dictatorship, has a functioning, independent judiciary and generally abides by international law. So there is a far greater level of trust there because there are legal mechanisms to prevent breaches.