It seems kind of inevitable that we will discover that Chinese intelligence agencies have been spying on millions of people's homes, businesses, and government offices.
Their government is hostile to most Western countries, to some degree or another, and have the ability to intercept and control the products of every Chinese manufacturer without any legal recourse.
It seems obvious, or at least very likely, that Chinese intelligence agencies backdoor consumer electronics (TVs, routers, switches, wifi APs, ESP32s, air sensors, and the rest).
Maybe they're risk averse and only enable spying on specific devices (government workers, specific targets, and the like)?
Technically any device that supporters auto-updating could be backdoored at any time, for example with targeted firmware delivered to specific devices.
Maybe the NSA is on this and spends a lot of time reverse engineering consumer electronics but sadly I tend to doubt it.
Are there any independent security researchers that spend their time looking into this potentially massive problem?
The bottom line is that if the answer to this question is important, assume yes, and for all threat actors.