Ad account tier isn't an official Meta label but a practical shorthand agencies use to describe how much trust and stability an account has earned — a brand-new account with no spend history behaves very differently in the auction and under review than a multi-year account with a clean record and consistent spend.
Higher-tier accounts generally see fewer holds on new ads, higher initial spend limits, and faster review times, which is why agencies protect their best-performing, longest-standing ad accounts carefully and avoid risky account behavior (rapid creative churn, policy-adjacent content) that could damage that standing.

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