<b>Our read: 'premium' pop sources that hide sub-IDs are laundering bad zones</b>
When a network won't pass granular sub-ID or zone data, it's not protecting suppliers. It's stopping you from blacklisting their worst zones.
— The mechanism: aggregate the good and the toxic into one opaque source, sell at a blended CPM, keep you from cutting the dead weight.
— The demand: insist on zone-level reporting before you scale. No granularity, no scale budget.
— The tell: your overall ROI is mediocre but stable — the mark of a blended source where winners subsidize garbage you can't see.
— confidence: medium
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