Technically, Apple does not have a monopoly, unless you want to argue they are the monopolist of the market for iOS devices. They don't even have a majority market share of smartphones in most jurisdictions. That being said, I still believe it is an abuse of market position, and I'm not sure how we can fight it.

In most parts of the EU Apple has a marketshare around or below 15%. That’s about the same that Windows Phone 7 had at its peak.

So, think about how much of a monopoly position Windows Phone 7 had, and try to imagine Apple had that. You can probably imagine why Apple is not in any shape to abuse their position.