The mistake here is thinking iphone is your own device. If they can view anything stored there, remove anything from there, control anything you install and run

The mistake here is thinking iphone is your own device. If they can view anything stored there, remove anything from there, control anything you install and run, disable it at any moment they wish - do you actually own it, or you just granted the use of it as long as Apple approves of it? Apple certainly doesn't ask your permission to do anything on "your own device" - but you have to ask theirs. Is that how ownership works?