[risyachka]

It is not an abuse of power when you created a phone many years ago, and when it was way less popular you told everyone beforehand that it will be impossible on install random software, only though store.

It is called a built-in feature and iPhones were designed with it from the very start.

[kuschku]

The first sold version of the iPhone had no app store and only allowed web apps to be used. Without Apple having any say over what you could install or not.

It was also marketed accordingly.