Legitimate apps update automatically via the Play Store to patch security holes and add features. A modded APK does not. You are stuck on an old, vulnerable version of the app. If a major security flaw is discovered in the legitimate version, your modded version remains open to exploitation for months or years.
The legitimate version of Controlla operates under a freemium model. Users can listen for free with advertisements, or they can pay a subscription fee for "Premium" access, which typically removes ads, unlocks unlimited skips, and offers higher bitrate audio. Controlla Premium Apk