To permanently opt-out your device from receiving AppLovin ads from any app using the AppLovin SDK please install the AppLovin opt-out app.
AppLovin will not use this information for any other reason than to opt-out your device from receiving ads. You may uninstall this app once downloaded. It does not need to remain on your device.
If you are on iOS you can choose to not be tracked by Ad Networks through Settings → General → About → Advertising → Limit Ad Tracking.