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pilhofer They get paid multiple times! Advertisers pay for verification tools inside the ad frame; Publishers have to pay to provide the key values to bid systems to avoid what you see here; & some middlemen tools will also pay verification tools to create additional layers of security.
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pilhofer Sometimes one brand's piece of verification software will be running multiple times on behalf of a single ad! It's not uncommon for both DV and IAS to be running multiple times per ad and getting paid out on both ends of the transaction.