Until a few days ago, there was no way of finding out if an Android app had ads in it or not. It would tell you if there were “in-app purchases” but in most of the cases, if you were downloading free Android apps from the Google Play Store, there was no way of finding out if the app has ads in it.
Now you can know if an Android app has ads on it. But what I find problematic is, as you can see from this Android Authority screenshot, the message that informs you whether the Android app contains ads or not is displayed when you have already installed the app and you’re about to open it. I think this message should be displayed under the “Install” button instead of under the “Open” button.
Informing users whether an Android app has ads in it isn’t something Google decided to pop up suddenly. The planning has been going on for many months. According to the above link, in 2015 itself Google had started telling the app developers that they should flag their apps within the dashboard if they contain ads in them.
Again, if you want to know if an Android app has ads in it or not you would like to know it before you go ahead with installing the app rather than knowing it when you have installed the app. Anyway, this feature isn’t available everywhere and it is being gradually rolled out to different parts of the world.