Based on Vantiv's letter to its clients that NYT got its hands on, the payment processor was caught in the middle of the services and the law. It got a cease-and-desist order from NY attorney general Eric T. Schneiderman, and later on orders from judges in Massachusetts and New York, despite the websites being allowed to operate in the Empire State while their appeal is ongoing. All the uncertainty surrounding the industry has forced Vantiv to pull back and suspend processing payments related to it in the meantime.
The letter reads:
As you are aware, an increasing number of state attorneys general have determined that daily fantasy sports ('D.F.S.') constitute illegal gambling... As payments experts in the online gaming space, Vantiv will continue to work with stakeholders for a long-term solution to the ongoing D.F.S. controversy. When there is better clarity and long-term certainty around the regulatory and judicial landscape related to D.F.S., Vantiv may decide to resume processing these types of payment transactions.
There might be some miscommunication going on, though, since DraftKings lawyer David Boies told NYT that Vantiv hasn't notified his company of these plans. Further, he said the processor is "under court order to continue to fulfill its contractual obligation to DraftKings."