In-app purchasing is beneficial for both developers and users. Developers earn money when users purchase their apps. At the same time, users benefit from the app through an easy way of purchasing needs. Some developers allow this to happen because it is a way for them to improve their apps, to make it user-friendly and enjoyable. If you want to purchase an app that requires IAP, you do not need to worry because some apps have a free trial. Google Play for Android now offers free trial for apps that needs a subscription.”]
Source: https://gbhackers.com/what-android-users-need-to-know-about-in-app-purchasing/