Forbes published an op-ed spelling out what the ad industry needs to know about ad fraud as 2018 comes to a close. "The $7.4 billion ad fraud figure quoted in Senator Warner’s letter, though not limited to fraud enabled by the tech giants, amounts to an enormous overpayment by advertisers," the op-ed reads. "The letter came on the heels of a Buzzfeed expose of a multi-million dollar fraudulent scheme using Android apps."