majorly different culture
thinking about it, this is still isolated (individual) incident where language barrier is the most contributing factor. the conwoman is probably the only person in the position that can talk english comfortably, others not so, so the team fell into her. be it the appointed staff from keyboardio know how to talk chinese, they will have more option to choose their "account manager" or talk their way around other people in the factory asking things etc. there is no anything wrong with the "culture" generally, other people are doing ok, you pay i do you dont pay i dont release, thats what happened to the factory owner, he also get conned by the lady and wasted piles of qwerty pads collecting dust. its just they want to get rid of anybody they dont understand, this is normal happening even to you and me. putting this occurence in the shoulder of "China" is a bit misleading and unfair imho.
ways of doing business
yes maybe there are differences in the workflow and requirement. knowing the language may unravel more.
and legal systems.
from the story, the legal system is pretty strict there, 10 years imprisonment and in full control of law enforcer once the issue get in their hand. it will not even benefit the victim, unrecovered money due to she will not see the sun again for the next 10 years. that why they want to resort this on their own and the lady didnt try to get lost, otherwise she will not be able to leave country. try another country where tourists got killed, and nothing happened, no action and no justice to the demised family however many they made the report/complaint.
any country has their conmen and conwomen regardless of culture and legal system, thats why they have detention area (jail) everywhere. this is more of a bad and good people matter. ymmv.
edit: and why they want to sub contract this to China anyway? there are many other places, like Malaysia for example, we have many english talking people here and factories, currency is a quarter vs US or worst compared to EURO, even why dont go to manufaturing facilities in their own country? the answer is simple, but yet China is advancing due to this simple reason... as someone said you get what you paid for, but its still not suitable in this case imho due to this isolated incident, they were just having bad days with the wrong people. or maybe this is just karma (unproven) effect, you did bad, the bad will come back right at you.