For apps that request permissions (READ_CONTACTS, SEND_SMS), nullers often add a few lines of code to silently export all user contacts to a remote server. What happens next? Your users get spam, and you get sued for GDPR/CCPA violations.
Many nulled apps come with a pre-installed PHP admin panel (for the web backend). Nullers frequently add a hidden "super admin" user that they control. Example: The nuller adds a SQL line: INSERT INTO admins (email, password) VALUES ('hacker@nuller.com', 'backdoor123'); Six months later, your entire user database is deleted.
A legitimate premium Android app (purchased from marketplaces like CodeCanyon, SellMyApp, or directly from a developer) typically includes:
Nullers love Firebase Cloud Messaging (FCM). They often leave their own sender ID in the code. Six months later, all your users receive a push notification: "Update your banking info at [phishing link]." Your reputation is destroyed overnight.