The bad actor here is DoubleClick, which is part of Google. Google is famously known for being squishy-soft on advertiser vetting. They had to pay $500,000,000 to the U.S. Department of Justice for knowingly hosting ads for steroids and other drugs. (The FBI caught Google in a sting operation. http://www.wired.com/2013/05/google-pharma-whitaker-sting/ "“I want to be the largest steroids dealer in the US,” Whitaker told the Google rep.")