Most Chinese goods are not good quality actually, all they just need is to earn they don't care
About the concern and feelings of their customers as well.
Actually that's not exactly the case anymore as everyone are now striving to make trash that breaks easily so you have to replace it. There are also the goods from Turkey for example which are often much below the quality standards of the Chinese.
However I've heard that China has outsourced some of it's manufacturing capabilities to Africa, so that would explain abysmal quality in some of their stuff.
In China there are different trade as it is in Turkey too. There is an official production and is a cottage industry. For me it is a different China. Let me remind you that the official iPhones in General produced only in China. And there are black iPhones are only superficially similar, and inside the shit.