yeah all ad networks are sending out FanDuel Ads and DraftKings Ads to USA. I saw from Airpush, StartApp, Heyzap, Mobilecore, and im sure others are doing it as well.
Google Secretly and quietly approved both of these gambling apps to their app market. I got one of my apps suspended because of it, and they denied my appeal despite my claims of them approving the apps on the app market.
Google Play quietly approves gambling apps ahead of the NFL season - Fortune