I think the math in your linked post is wrong; it looks like you’re confusing App Store revenue and Apple revenue. App Store revenue is the gross sales of the

I think the math in your linked post is wrong; it looks like you’re confusing App Store revenue and Apple revenue. App Store revenue is the gross sales of the App Store. Apple takes at most 30% of that as their revenue; the rest goes to the app developers. So to calculate Apple’s profit margin for the App Store, you would compare only that Apple revenue to Apple’s actual costs of running the App Store. So their App Store profits are not 78% of $64 billion. They are 78% of at most 30% of $64 billion. So no more than $15 billion, not $50 billion.