The quality of Facebook agency accounts depends on various factors. First, the GEO of the account can impact its stability—Tier 1 regions (US, UK, Canada, Western Europe) tend to be more stable but face stricter scrutiny, while Tier 2 & 3 regions (Asia, Eastern Europe, LATAM, Africa) may have easier ad approvals but are more prone to being flagged. Regarding account types, self-serve accounts usually have more restrictions compared to credit-line agency accounts, which benefit from a stable payment history. Additionally, aged accounts with prior spending history are generally more reliable and less likely to be flagged than fresh accounts, which require proper "warm-up" strategies to avoid bans. To maintain a long-lasting agency account, it’s crucial to have consistent spending patterns, follow ad policies, ensure clean IP & device usage, use reputable payment methods, and avoid sudden suspicious activity.