Readability's bead and butter is iOS, they stand to make a lot of money removing ads from website to make them better and easier to read, without iOS, they would not have this opportunity to make $5 a month off of people. The app is free and hosted by Apple. And people don't understand why Apple is going to start demanding a cut of these sales. Readability isn't the only company out there making a lot of money off of iOS, Apple made these companies and they have now come to collect.