As the name suggests, this type of bonus allows you to place free bets equal to the value of bonus. For instance, if you got bonus worth $100 at the time of sign up, you can place bets worth this amount in various games. This is really good option for trying new games on various casinos. You might get lucky and make some money without the need to invest anything.
Did any of you made huge money with this bonus amount ?
I did win any amount of the bonus that they gave me. After 4 attempts on different gambling sites, I realized it is just a bait. If ever that someone did manage to win, I doubt that it is a real player and just an employee of them to invite more users.