Oh yeah, to be clear I was just clarifying the structure. I don't consider American companies to be any more trustworthy than companies based elsewhere.

The US is far, far more of a threat than China even remotely is. That being said, I highly doubt the GOS devs would even consider any collaboration if a backdoor was ever a possibility.

Simple answer is yes.

However, Lenovo have full legal and financial control over Motorola. But because Motorola is a subsidiary, it's legally distinct from its parent company. And because it's incorporated in the USA it has to be compliant with US law. So, for example, Lenovo is not permitted to compel Motorola to violate US law.

For as long as major powers control the production of the majority of computing devices this will be true. But as far as I know there are no short term alternatives for completely open mobile device hardware... so if hardware backdoors are in your threat model then unfortunately mobile devices are not for you...better stick to the very small community of open hardware for laptop/desktop computers for your communication needs.