I believe that would depend on your deposit status. Usually at NBB, if you are a current depositor your winnings from bonuses are good. For the rest, it's just probably not going to work out for a withdrawal.
Each time in their email, you will find something similar to this:
Terms and Conditions apply for each special and we highly advise you not to play in rooms or claim/receive deposit bonuses without reading the terms and conditions of each special. We try to be as specific as possible when writing the terms for each promotion so please, before you take advantage of the specials inside this mailer, CLICK HERE and take a moment to read the rules. By playing or requesting bonuses you’re accepting the rules.
General Terms and Conditions will also apply to any of our promos. General Terms and Conditions can be read HERE.
It seems they try hard to inform the players of the conditions, unlike some other sites.
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