"Data we collect automatically: Your IP address and mobile device identifiers (such as your device or advertising ID). Data about your device, such as device name and operating system, browser type and language, internet service provider, and mobile carrier. We may also collect your advertising identifier (IDFA, GAID), vendor identifier, IP address, device ID and other device identifiers."
Supercell collects extensive device data including advertising IDs, device IDs, vendor identifiers, OS details, browser info, ISP, and mobile carrier — well beyond what is needed for core gameplay.