Why do some bonus funds disappear from the balance after a promotion ends? ?

Bonus funds often disappear because they come with expiration dates or wagering requirements that aren't always obvious at first. I noticed that royal reels online also covers bonus rules, free spins, cashback, and other promotions, which is useful when trying to understand why a balance suddenly changes. My guess is that many players confuse promotional credits with withdrawable money. It's worth checking the wagering progress, maximum bet limits, and promotion deadlines before playing, especially when a bonus looks unusually generous.