As far as I know, BetFury's withdrawal fees for Bitcoin are not too high and solely cover the expenses of running the business.
I disagree with that. Betfury offers two options to withdraw BTC (fast and slow), and in both options, the withdrawal fee is too high. So for fast withdrawal, they ask for 25k sats(~$23), and for slow withdrawal, they ask for 7,5k(~$7). For comparison, the current BTC network fee is only 2 sats per byte.
The good thing is that Betfury has Cryptoswap, and many other alts are available where they offer more favorable withdrawal fees.