Payment processing fees can significantly impact the profitability of online casinos by reducing the net revenue generated from player transactions. These fees, which can include fixed costs or percentages based on transaction amounts, can accumulate rapidly given the high volume of deposits and withdrawals typical in this industry. When these costs are not effectively managed, they can eat into profit margins, particularly during promotional periods when casinos may offer bonuses or free bets. Furthermore, if casinos choose to absorb these fees, they may find their operational costs increasing, affecting overall profitability.