Devil's Advocate
Putting aside politics, what do people here think are the chances that Chinese-made CCTV cameras have a built-in government-mandated backdoor? I'm asking from a purely technical point of view.
Personally I think it's obviously possible, but I suspect keeping it from being discovered would be extremely hard. Given enough time, I feel it would be found, sooner or later. And then there's the human point of view i.e. you have to keep everyone involved sworn to silence for the rest of their lives. It's a tough ask.
As for exploiting the security of the absolutly shite software they tend to ship with (I have plenty of painful experience as an end-user here), I would say that would be by far the easiest attack vector for any government to exploit. So why bother with a backdoor at all? If it was discovered the ramifications would be enourmous.