A case study by Marketing Science analyzed 1 billion ad impressions across nearly 1,000 mobile apps, revealing that 9% of apps accounted for 52% of impressions, with 66% being fraudulent. The remaining 91% of apps generated 48% of impressions, with an average of 18% being fraudulent. Overall, the analysis found that 43% of all ad impressions were fraudulent, highlighting significant issues in mobile display advertising.
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