[runjake]

Almost all of the apps you mentioned sync data to, or access data from iCloud in the vast majority of use cases. I mention iCloud here because this submission is about iOS.

That said, I'd love to have a new "Internet access" permission for apps, so users had the choice. Perhaps even separate "Allow iCloud" and "Allow Internet" but that's probably too granular for Apple's taste.

[arcanemachiner]

For that case, iOS could just run a system daemon to shuttle the app data to/from iCloud. The app itself should not need internet access for this.

I have no idea if this is what already happens, but I feel like it might be. (Why would each app have all these network connections when the system could just manage it instead?)