Our main OSes, desktop and mobile, have quite a few backdoors though I couldn't speak to whether the government forced them to do it. Mobile phones, mobile networks, and most (if not all) of the internet trunk lines include backdoors for the government to use. Data collection isn't technically a backdoor, though functionally it is as it allows the government to do what they want to while dodging regulations for search warrants and similar.
The Twitter files point to another backdoor, even if again not technically quite a software "backdoor".
If we stick to the strict definition of a backdoor, the CCP very likely has more control over companies and does require software backdoors for the government to access. In a more general sense though, I at least wouldn't consider the US or the EU to be meaningfully better about the government having access to and control of tech in much the same way.
Are vendors in the US or EU required to do crap like that while also being prohibited to admit it? Of course services that collect the data "in the cloud" share that data with the government, but this is official and predictable.