Claude uses a points system. Accounts receive an initial score upon registration, then gain or lose points based on behavior. Falling below the threshold results in a direct ban. Recovering points is very difficult.

Factors affecting scores:

Registration

> A clean IP is the most important factor. It doesn't have to be residential broadband, but it must be clean.

> Gmail is no longer the optimal choice; there are email services with higher weight.

> Accounts that prompt for KYC right upon registration can be discarded.

> Registering via the mobile app adds points.

Payment

> Subscribing immediately after registration deducts points.

> Jumping straight to Max deducts a large amount of points. It's best to wait two days and subscribe to Pro first.

> Being prompted for KYC during payment indicates the account is in a review period, but it won't necessarily get banned.

> Foreign entity bank cards add points. Google Play works too. Virtual cards deduct points.

Usage

> Don't exhaust the limit in one go. It's better to rotate between two accounts than to max out one.

> The desktop client gives a small points boost. Use the web version as little as possible.

> The mobile app also gives a small points boost.

> Enabling the memory feature adds points. The more memory files, the higher the score.

IP and Device

> Stability is key. Don't switch IPs; stick to the same one as much as possible.

> Proxies must be in global mode with TUN enabled.

> Logging in from multiple devices deducts a large amount of points. The ideal setup is one computer, one client.

> Frequent IP changes, frequent logins, and high concurrency all deduct a large amount of points.

Account Age

> Old accounts have huge leeway for errors. 2023 accounts clearly score higher.

> Scores grow over time, but very slowly.

Other

> No difference between Windows and macOS. Linux deducts points.

> Time zone and language have basically no impact. You won't get banned just for using Beijing time.

> Telling Claude you're Chinese is fine; memory won't trigger a ban.

> Heavy use of Fable deducts points.

> Upgrading to Max likely puts you in an observation period, unless it's a high-weight old account.

Observation Period and Banning

> When nearing the threshold, the account may enter an observation period. A typical sign is getting logged out.

> Continuing to deduct points during the observation period leads to a ban.

> High-score accounts can survive multiple observation periods.

(http://www.autoadmit.com/thread.php?thread_id=5916333&forum_id=2#50214981)