Sideloading software expands user freedom, but demands vigilance regarding Android runtime permissions and malware inspection.
Auditing Runtime Permissions
Spotify legitimately requires permissions for network communication, audio focus, Bluetooth playback, and foreground services. It does not require access to your SMS inbox, contact book, or phone dialer.
If any sideloaded music app prompts for messaging or contacts access, immediately reject the prompt and uninstall the application.
Using Android's Application Sandbox
Android runs each installed app inside a dedicated Linux user sandbox, isolating files from other apps. Ensuring your device runs modern Android versions (Android 11+) guarantees robust sandboxing defenses.