Both the Apple App Store and (I believe) the Google Play Store have requirements that any digital goods purchased through an app that's distributed through the App/Play store use the payment system provided by Apple/Google, which takes a 30% cut in most cases.
This is a big deal because both Apple and Google have been fighting to keep that 30% cut for years, despite the fact that neither company is really providing much value as a payments provider; they're just extracting rent from their monopoly position as the distributor for apps in iPhone/Android land.
This is a big deal because both Apple and Google have been fighting to keep that 30% cut for years, despite the fact that neither company is really providing much value as a payments provider; they're just extracting rent from their monopoly position as the distributor for apps in iPhone/Android land.