App stores (iOS App Store, Google Play Store, Microsoft store) charge a percentage of sales made through the stores.
Which services do these stores offer that warrant them to receive up to 30% of sales.
An app in any app store already has 30% off it’s revenue. That is a huge amount. For some businesses, that is profits.
I assume business have to pass this 30% to someone else before they can make a profit. Guess who that someone is? Consumers