As I understand it, software updates are different from operating system updates. And Apple can and should be trusted with providing updates to their computers without worry.
Generally speaking, no, since companies such as Apple and Google clearly track their customers and identify their region. You will be served malware or anti-features if a government requests them, and you may not be informed at all (Snowden revealed Apple’s ties to the NSA long ago). If you fear state-sponsored surveillance you absolutely can’t trust any Big Tech company.
Well, Apple’s historical stance when it comes to court orders that require them to release Apple-signed software containing a backdoor has been to:
Refuse even though they are legally required
When the government complains they are refusing to follow through with a legal order, they bury the government in lawyers because they have more money than god
So, I think it’s probably reasonable to think Apple devices will not suffer from this particular problem. When it comes to the operating system there is not a particularly good way for them to target a specific user without jeopardizing all other users, which Apple has not done before.
Individual developers of apps from the App Store, on the other hand, could certainly pose a threat. Additionally, I would not fully trust iCloud where Apple could more easily target a specific customer, although I personally would deem that highly unlikely, especially if using Advanced Data Protection.