Many players mistake a bonus for "free money" that can be withdrawn immediately. In reality, casino bonuses are extra play credits granted to you to extend your gaming experience. The most critical distinction to understand is the difference between your Cash Balance and your Bonus Balance.
When you claim an offer, the funds are typically placed in a separate bonus wallet. Most platforms operate on a sequence where your real-money cash balance is used for betting first. Only after your cash balance is exhausted does the system begin utilizing the bonus funds. Because bonus funds are subject to specific conditions, they cannot be withdrawn until they have been "converted" into cash through the completion of wagering requirements.