With the vast majority of sportsbooks, the fees are covered. As always, this isn’t the case with all sportsbooks as some will charge small commissions fees to users. But most sportsbooks offer great bonuses on deposits and withdrawals, making Bitcoin a preferential option to the user.
When sending Bitcoins between users, there’s usually a very small fee (no more than a few cents) attached to the transaction. Equally, if a user doesn’t want to pay a fee they can do the translation for free. But the transaction takes longer than the instantaneous transactions it would otherwise have if the fee had been paid.