The move acknowledges the in-app purchases that many of the free apps and games often contain. Of course, the button applies to the content that is completely free as well.
Apple is the latest industry heavyweight to react to criticism to the free-to-play business model with in-app purchases, especially by regulators in the European Union.
Critics have pointed that the aforementioned content delivery method often forces players into spending money in order to enjoy proper app or game experience.
The free-to-play business model is the current standard on both iOS and Android.
The setup is responsible for 92% of all revenue on iOS and 98% of the same on Android. Curiously, most of the revenue comes from high spending users, whose money essentially provides for the experience of those who are not willing to part with any money.