In this day and age "firewalls" are basically useless.
There is no boundary any longer , certainly in China where the majority of set top boxes and off brand mobile phones are loaded with backdoors built directly into the OS.
On top of that you have the multitude of Desktop & mobile software , specifically written to appeal to users requirements, character input methods, translation software, cloud based hand jobs.
looks like a translation app, acts like a translation app, unfortunately when your logged into you tax or banking app, there it is screen capping and sending highly confidential data back to the cloud and all without data encryption, but hay... it certainly translates shit.