Fantasy Sports $DFS is bilt on Ethereum blockchain. At the time of writing this review it is listed on very few Exchanges with little trading volume too. Their official twitter page has been private with 0 following and followers for a while which personally I feel is a bad choice.
It is not made clear its actual usecase, apart from its obvious use as a means of payment within its gaming ecosystem and outside. The project has smartly implemented its $DFS coin into its line of games, whereby users have to buy the coin in order to make bets or create betting events.
All process in their gaming products are done using smart contracts which makes the Digital fantasy sports claim to be decentralized. This way payments process are completed quicker and more effectively. I think the project is a good idea, but quite a few cryptocurrency projects out there have already capitalized on fantasy sports gameplay. It is actually a big market though, so I guess everyone can have their market share.