January 24, 2020 9th Methbot suspect arrested in massive clickfraud ring How Sergey Denisoff described his early ad-buying ventures: buying BS popup traffic and reselling it to buyers demanding BS traffic. Naked Security
November 30, 2018 Busted! DOJ exposes huge ad-fraud operation, eight charged The US Department of Justice has charged eight men with running a vast ad-fraud scheme. Naked Security