You can set a monthly gambling limit on your debit card as a way for you to control how much you are spending on gambling. Once you reach your limit, any more attempts to make gambling transactions with your debit card, will be blocked.

Most large issuers don't allow online gambling purchases\n\n Many major issuers in the United States, such as Chase, Wells Fargo and Citibank, for example, specifically address online gambling in their card terms, whether to prohibit it and other illegal activities  or to outline how it will be handled.