It's good but staking is always dangerous as there is Impermanent Loss risk and people who invest in BFG token must know about it.
Staking, like just holding funds on Betfury or any other centralized platform, is always a risk. I would be more worried not because of impermanent losses but because users of centralized platforms are at risk of hacks and scams. In addition to that, centralized platforms can simply freeze user funds under regulatory pressure. Thankfully, Betfury users have not experienced this yet.
I believe impermanent loss is only present when staking on the exchange liquidity pool since you are staking 2 assets as pair that cause this loss.
But Betfury staking is a straight single staking so impermanent loss is not the risk we should worry about rather the stake token value depreciation itself.