We know that new(er) cars have spyware controlled by some government or corporation. If my privacy is going to be violated, I’d rather have a hostile gov/co do it. I’m not a government employee. When it comes to national security, I’m a complete nobody. I don’t give a shit what Beijing knows about my life, because they don’t care, and probably won’t share info with the West. Maybe they’ll share it with Russia, but again, that’s irrelevant to me.
I want Washington (and, to a much lesser extent, Ottawa) to know as little as possible, because I don’t trust them, and it’s much, much easier for them to make my life difficult if they want to.
By far, you should worry about your own government disapproving of you, and then using your car to kill you. Worrying about China only applies if your government helps force war on China. Probably the reaction to war on China, by China, is bricking your car instead of targeting everyone to crash or become an Israeli pager.