Despite all the changes going on, there are still three main monetization strategies for apps. Paid downloads Free downloads, app is monetized by in-app ads (similar to how Adsense might appear on a website) Free downloads, app is monetized by in-app purchases (most prominently shown with mobile gaming pay-to-win style games) These can be mixed and matched. Some apps might be paid apps, for instance, that still have in-app upgrade purchasing opportunities.
