Shave/scrub = network suppressing legitimate conversions to lower paid totals.
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Expected conversion-rate noise on stable traffic, 7-day window: +/-8% ▏▏▏
Drop that survives 3 consecutive windows on flat traffic: signal, not noise
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Networks flagged for shave in samples showed approval rates falling 12–22% with no source change (n=19 documented cases)
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Control: split 15% of identical traffic to a second network as a baseline mirror.
Read: only a parallel control offer turns a suspicion into a measurable shave figure.
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Detecting silent shave needs a cohort, not a hunch
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