When you’re a marketplace, especially a big one, both the people buying in your store and the people selling in your store start to look like customers, both pa

When you’re a marketplace, especially a big one, both the people buying in your store and the people selling in your store start to look like customers, both paying you for access to the other. For the sellers is obviously more implicit, but still often explicit like grocery stores getting paid to put specific products on aisle end caps and such. The whole 30% fee is premised on providing services to app makers for money.