That's not uncommon. But normally the mall isn't the only mall in town.

I consider Amazon and the Apple App store to be not like stores or malls but like streets or cities. They are the market, not in the market, and if someone wants to enter the market they have to pay Apple/Amazon for the privilege. They bought/built the street and now instead of charging a cut they are charging a tax.

Stores pay a hefty sum of rent to the mall, not sure thats a reasonable comparison.