In addition to that, there are permissions that Apple gives to its own apps that it denies to competitors even if the user consents to it, e.g. permission to in

In addition to that, there are permissions that Apple gives to its own apps that it denies to competitors even if the user consents to it, e.g. permission to install third party apps is given to Apple's store app without asking but can't be given to the Steam app even if the user wants that.