I understand Apple taking 30% from the initial app sale, but not from the subscription. Apple is only acting as the credit card processor in this case. They don

I understand Apple taking 30% from the initial app sale, but not from the subscription. Apple is only acting as the credit card processor in this case. They don't host or deliver the in-app/subscription content you buy, so you are taking this hit as well after the 30%. What if Mastercard/Visa charged you 30% to process cards?