Blacklisting 6 sub-ids removed 71% of fraud while keeping 96% of revenue.

Blacklisting 6 sub-ids removed 71% of fraud while keeping 96% of revenue.
Cohort: one CPA offer, 142 active sub-ids, 30-day analysis. Fraud flagged by network scrubs + duplicate-IP clustering.

— Pre-cleanup: scrub rate 18% across all traffic ▏▏▏▏▏▏
— 6 sub-ids accounted for 71% of scrubbed leads but only 4% of clean revenue
— Post-blacklist: scrub rate 5% ▏▏, revenue retained 96%

The long tail of 136 sub-ids was clean; the damage was concentrated in 4.2% of sources.

Read: fraud followed a power law — pruning 6 sources fixed a network-relationship-threatening scrub rate at a 4% revenue cost (n=142 sub-ids, 30-day).