FanDuel Sportsbook NJ | 2020 Review Commercial Content. Play Responsibly. 21+ FanDuel Sportsbook came to New Jersey in September 2018, following the overturning of the federal ban on online gambling. Although it can’t claim to be the original online sportsbook, that doesn’t mean it’s not the best. Backed by the European betting powerhouse Paddy Power Betfair, the FanDuel Sportsbook was always set to make a big impact on the sports betting market.