One popular app monetization strategy is to offer both free and paid versions of your app. The benefits with this strategy is two-fold. On the one hand, it provides a free option for users to experience the basic functionality of app at no cost. Another popular app monetization strategy is in-app purchases, or IAP. The app itself, and usually the basic features of the app, are free. In some cases, users can still get access to premium features or functionality without paying. If they are patient enough to wait for certain features to be unlocked or to engage with the app frequently enough, then they can use the app for free indefinitely. Some developers choose to create free apps with a subscription model. With this strategy, the app is made free to download with limited access to the content or services offered.
You can read more here: https://admob.google.com/home/resources/5-app-monetization-strategies-to-grow-and-monetize-your-app/
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