If you successfully complete the playthrough requirements, you can cash out a profit. This gives you a chance to essentially test drive the online casino, and it provides the casino with an opportunity to win you over as a long-term customer – although you are under no obligation to do so.
You then need to play the bonus funds over a certain number of times before you can cash out your winnings.
Some of the best online casinos will simply provide you with bonus credits after you complete the registration process. They provide you with site credit, and you will not need to risk any of your own money to unlock it.
No deposit bonuses provide prospective customers with a compelling incentive to sign up with an online casino.