Confirmed: how the desks build a zone blacklist that actually sticks

Confirmed: how the desks build a zone blacklist that actually sticks
The pros don't blacklist on a bad day. They blacklist on a bad pattern.
— Pull 7 days of zone data, not 1. One spike is variance, three is a trend.
— Rank zones by EPC AND volume. Cut the bottom decile only if it has 200+ clicks (statistical floor).
— Cross-check the cut list against your OTHER campaigns first — a zone dead for sweeps can convert on installs.
— Push blacklist via API, then re-pull spend at +2h to confirm it took. Half of pop sources 'forget' blacklists.
Keep a rolling 'parole' list to re-test monthly.
— confidence: high