Well, first off, I never called it a backdoor. I just laid out the pitiful security situation Apple created for their Chinese users. You're the one putting words in my mouth.

Secondly, yes, especially if it's OneDrive. Both iCloud and OneDrive are first-party software products, they are built-into their respective operating systems as native features. If BitLocker was compromised, it would be a "Windows backdoor" too.