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For PercussionTutor on Android we have implemented Unity Analytics, not Ads(!). Unity Analytics collects gameplay and device data. This information is collected to improve Unity-built games and apps by providing analytics, diagnostic, and usage information to us. Unity also uses the data to allows us to tune their apps for player devices and create personalised experiences.
Under https://unity3d.com/legal/privacy-policy you can find Unity’s privacy police.
In the PercussionTutor Android app under the Privacy Menu on the home screen you will find the following button which will open Unity’s website where you can request your data and opt-out.