Then there's the #AppTax. Apple charges app makers a 30% commission on all their sales, which means that certain businesses literally *can't exist*. Take #audiobooks: audiobook sellers have 20% gross margins on their wares. If they sell their audiobooks through apps and pay a 30% vig to Apple, they lose money on every sale. Thus, the only Ios app that will sell you an audiobook is Apple's own #AppleBooks.
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