what portion of all digital engagement is outright faked? This is from 2016..

fire faked traffic from more than 570,000 bots at those ads, thereby driving revenue thanks to the pay per click system they exploited. As part of what White Ops called the Methbot campaign, those bots “watched” as many as 300 million video ads a day, with an average payout of $13.04 per thousand faked views

https://www.forbes.com/sites/thomasbrewster/2016/12/20/methbot-biggest-ad-fraud-busted/