Promo abuse is a type of fraud on Android where bad actors take advantage of a business's sign-up bonuses, referrals, coupons, or promotions by creating new accounts over and over again . What is the best way to identify and blocklist abuser's device ? Talsec's analysis indicates that MediaDRM could be the most effective solution .

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https://medium.com/@talsec/fraud-proofing-an-android-app-choosing-the-best-device-id-for-promo-abuse-prevention-aa4a2459637f?source=friends_link&sk=adabe510416712dfa8d9522e7172c411