Plenty of remote gambling websites lock cashback bonuses behind promotional codes so that players can choose between enabling the bonus, going with another promotion, or simply choosing to not take advantage of any promotions. If your casino enrolls players into the cashback bonus automatically, however, what you can do is not meet the opt-in requirements. For example, if an unlimited cashback promotion requires you to log in and deposit on Monday, you can simply wait and deposit on any other day of the week.