OKX CEO Star responded: Currently, there has not been a single case of user data loss that was completed by switching from GA (Google Authenticator) to SMS (text message). The authentication-free address is designed for API users to automatically withdraw money, and setting a limit does not meet actual needs. It is possible to consider introducing a silent mechanism for automatic expiration of authentication-free addresses. The GA security level is indeed slightly higher than SMS, but it is not absolutely safe. Methods of stealing user SMS include device Trojan implantation, SIM card copying, fake base stations, and stealing through SMS service providers. Hackers who steal user GA can implant Trojans on user devices or steal Google accounts (turn on cloud synchronization). OKX will compensate in full for data losses caused by its own reasons.