FanDuel has partnered with Boyd Gaming to rebrand its Betfair Casino app in New Jersey to Boyd's hugely popular Stardust Casino. The Stardust real-money casino app will also be launched in Pennsylvania in April on top of the operator's FanDuel Casino site.
For this reason alone, Betfair has no reason to ban or close your account when you should win. This is what Betfair first became famous for; peer-to-peer betting. Whilst the Exchange account won't be closed for winning, there is an additional commission rate.