Many sites offering "free keys" or "keygens" are fronts for distributing spyware, ransomware, or Trojans.
Clean Master’s servers track invalid license attempts. If you try to use a cracked key that has been used thousands of times, the app won't just reject it—it may blacklist your device ID, preventing you from ever installing a legitimate trial again.
for standard troubleshooting regarding license keys and payments. Clean Master Warning: Risks of Third-Party "Key Links"