You are equating "exclusivity" with "monopoly" --- which is another idiotic notion that forum posters like to talk about.
A monopoly is a persistent situation where there is only one provider or service in a particular market. Doesnt that sum it up? Only T-Mobile in Germany provides the service to operate an iPhone. An iPhone doesnt work with any of the other dozens of other providers. And two years appears quite persistent to me. And please don't use the phrase 'idiotic', you don't know what you are talking about. The iPhone is just an object.