While the promise of infinite gems is tempting, downloading unofficial versions of My Singing Monsters poses several dangers:
Removing forced third-party advertisements that often appear in the free version. Why MOD APKs are Risky
Developer Big Blue Bubble actively monitors for suspicious activity. Using a modified version can lead to a permanent ban for violating terms of service regarding account sharing or "hacks".
Bypassing the usual grind to buy premium monsters and speed up breeding.
Many MOD APKs from unofficial sites are bundled with malware , viruses, or "infostealers" that can log your keystrokes and steal personal data.