Anthropic has implemented mandatory identity verification (KYC) on the Claude platform, managed by third-party Persona Identities. This move aims to prevent abuse, enforce policies, and ensure compliance. However, users in unsupported regions, particularly mainland China, face potential account suspensions, effectively acting as a "ban nuke." Pro/Max subscriptions are also at risk of being lost. To mitigate these risks, users are advised to maintain a stable network environment, avoid frequent IP switching, and ensure consistency in payment information. High-risk behaviors such as using shared data center IPs or inconsistent billing addresses can trigger account suspensions. If KYC verification is required, users should promptly submit valid identification and verify their devices to avoid disruptions. In cases of account suspension, users can appeal through official channels, though success rates are low. For those affected, re-registration with a clean setup or switching to third-party platforms without KYC requirements may be viable alternatives. This KYC enforcement reflects Anthropic's broader compliance efforts, emphasizing the importance of a stable environment for users in unsupported regions.