Because the only monopoly they have is on Apple products. There are other phones, other laptops and other tablets available. No one is being forced to develop for IOS, no one is being forced to buy Apple products whether they want them or not. They may be the currently dominant player in the smartphone category, but unless both Google and Microsoft decide to abandon that market they can't be said to have a monopoly.
tl;dr: You may not like their policies regarding selling their software to their audience, but you are not required to participate in their marketplace to sell software.
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Because the only monopoly they have is on Apple products. There are other phones, other laptops and other tablets available. No one is being forced to develop for IOS, no one is being forced to buy Apple products whether they want them or not. They may be the currently dominant player in the smartphone category, but unless both Google and Microsoft decide to abandon that market they can't be said to have a monopoly.
tl;dr: You may not like their policies regarding selling their software to their audience, but you are not required to participate in their marketplace to sell software.