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I think that BFG token is platform-owned, not tradable. As far as I know, it is only achieved through play. With every bet you win or lose you get BFG.
Maybe I'm not right, but I think that's the case.
BFG token will be listed on some exchanges in the near future (see their roadmap for more information). For every bet you place (win or loose), you will get BFG.
The more BFG tokens you have, the more dividend in BTC, USDT, BTT and TRX you will receive every day.