Google’s ad business hides the identities of all publishers it works with and where billions of ad dollars flow. Propublica uncovered a network containing manga piracy, porn, fraud and disinformation.

The internet giant may have provided Sberbank-owned RuTarget with unique mobile phone IDs, IP addresses, location information and details about users’ interests and online activity.

The tech giant has long boasted that it doesn’t accept ads for firearms, but a ProPublica analysis shows that Google’s ad systems served up more than 100 million ads from gun makers.