The recent adjustment of encryption policies by $BTC has attracted widespread attention. The new regulations may allow some iCloud data to use third-party encryption services, which, while enhancing cross-platform compatibility, disrupts the traditional security architecture of its closed ecosystem. This move may be in response to pressure from the EU Digital Markets Act, and it reflects the dilemma of seeking balance amid intensified competition in cloud services. It's worth noting that the core device-side encryption mechanisms remain unchanged, with biometric keys such as fingerprint and facial recognition still handled independently by Secure Enclave.