■Android(Android SDK, UnitySDK Unreal EngineSDK, CordovaSDK)
Advertising ID and an SDK generated UUID are used.
■iOS(iOS SDK, UnitySDK Unreal EngineSDK, CordovaSDK)
From iOS SDK 1.29 and onward, only the SDK generated UUID is used.
Prior releases used both IDFA and the SDK generated UUID.
■Others
Only the SDK generated UUID is used.