The document discusses how digital ad fraud is a major economic crime. It is linked to other illegal activities like computer hacking and involves illegally accessing systems and data. Ad fraud costs the digital advertising industry billions of dollars per year. It involves faking impressions, clicks, and other metrics in order to steal advertising dollars. Many criminal groups view ad fraud as a highly profitable activity due to the very high returns compared to other crimes. The document outlines numerous examples of how ad fraud relates to other crimes like identity theft, money laundering, wire fraud and more. It argues that solving ad fraud would significantly reduce criminal revenues and get the digital marketing industry back to focusing on real users and customers.