A common misconception is that a casino bonus is "free money" that can be withdrawn instantly. In reality, bonuses are extra play credits designed to extend your gaming session and allow you to explore more games. When you claim a bonus, these funds are typically stored in a Bonus Balance, which is separate from your Cash Balance.
Mechanically, the platform usually utilizes your cash balance first. Only after your real-money funds are exhausted does the system begin spending from your bonus balance. Because bonus funds have conditions attached, they cannot be withdrawn until they are converted into cash through the process of wagering.