This is actually what it's designed to apply to. Inside your grocery app is a button that says "Subscribe to sync!" Apple handles the credit card processing a

This is actually what it's designed to apply to. Inside your grocery app is a button that says "Subscribe to sync!" Apple handles the credit card processing and takes 30%. You go to the website, and there's a button that says, "Subscribe to sync!" You pay for the credit card processing & recurring billing expenses, and 100% of what's left. Apple is assuming/hoping that the amount of people who buy your service through the app will offset the reduction in revenue.