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Is that the biggest? From 'the past' I believe (but no proof) that the fraud on normal display ads was/is much higher. Bot generated ad clicks, bot generated content to drive up ad prices etc should be much higher than $5m even by individual hacker groups? Maybe video ad clicks are easier to fake but worth less?

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If you take the low estimate of 3m$ a day, this is $1B a year. The often quoted figure I've seen for the size of the ad fraud "market" is $7B. That's a big chunk of a "market" that is mostly cottage industry. And as a bonus, they target the highly profitable end of the spectrum.

$5M per day is pretty big for an individual group, no?

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