It's not that they can't code, it's that they're coding in isolation. They don't have experience in using Android apps designed for foreign countries because they're literally blocked to do so. They see all apps are spyware in disguise and think it's totally ok to do so.

It's not a coincidence that Google play banned pinduoduo because it used forbidden ways to track users. Or the DJI app, banned from Google play too.

This policy only hurt themselves and it's undeniable. Like that time Tencent accidentally included literal malware in an iOS app because a dev downloaded an infected version of xcode from a random Chinese website instead of apple.com (accessing any website hosted outside the country is super slow)