https://www.entrepreneur.com/article/382195

Today we use applications for practically everything, this thanks to platforms that have allowed them to sell them, such as the App Store on iOS and Google Play on Android. If you are an application developer, the best thing you can do is have your job in one of those stores. But sometimes placing them on one of these platforms can be expensive.

For example: Apple's app store charged 30% until last year when it reduced this commission to 15%.