I have experience of the similar software quality issues, however none of this is unique to China, north America, Europe, India, China. My question was specifically related to the hardware most people run, which is often fabd China, given most people take it for granted that this is "safe".
The hardware is obviously suspect as well, but I can only speak for the number of actual backdoors I've been able to find in my own devices. Root shells on random sockets, "accidental" eval() in web UI elements, hardcoded passwords, actual processes just called `backdoor`. I especially liked being able to remove the IPMI password from a SuperMicro board I bought from eBay by making a HTTP request to a "buggy" endpoint that printed the root password back in plaintext.
