Bought Inapps allows to group users by the fact of purchasing in-apps. This will help you adjust the ads for such users or simply turn it off, if needed. 

To make this setting work correctly, please submit the purchase info via Appodeal SDK.

Android example:
​Appodeal.trackInAppPurchase(this, 5, "USD");

iOS example:
[Appodeal trackInAppPurchase:@(5) currency:@“USD”];