The problem is that the Chinese government has almost total control over Chinese apps, so American citizens are rightly afraid that Chinese apps might serve as vehicles of Chinese government propaganda.
It's totally okay for both America and China to ban whatever foreign stuff they want, though, and both of them have very good reasons to do so.
>Chinese government has total almost total control over Chinese apps
I agree. But watch what happens when you post something bad about an influential person on an American app. The feds pay attention to you more and lean harder on you. The end outcome is the same.
>Ban foreign content
How can we live in a world where it's ok for any government to decide what you can and can't see
There is no need to harm the second child-- you have to deal solely with the person who threw the first punch in a legal, rational, and fair way.