Some online casino bonuses and promotions may be one large offer or a series of smaller offers you can use during the timeframe. In the case of it being a series of smaller offers, you can technically take advantage of more than one bonus. 

You can also take advantage of sign-up offers and other bonuses/promotions across multiple online casinos. For example, you may already be a member at one online casino that is offering a special for current members, and you may also sign up to be a member at a different online casino and earn their special promotion sign-up offer.

However, you may not be able to take advantage of an online casino’s sign-up bonus multiple times by means that would break the rules or otherwise violate their site’s terms and conditions. For example, creating multiple accounts in order to collect the sign-up bonus or other bonus multiple times may break these rules and possibly disqualify you from getting your bonus, your winnings, and your ability to play on the site.