Again, this will depend on the casino you are playing at and the offer in question. Most free spin deposit bonuses work in one of two ways. In the first case, you are going to receive any winnings you pocket from your free spins as bonus funds. These are non-withdrawable but can be used to wager on virtually all games at an online casino. The second type of free spin deposit bonus will pay out those winnings in real money. However, you will still need to complete wagering requirements before you can cash out those winnings. There are a few free spin deposit bonuses which are wager-free (there is no playthrough rate), but these are not easy to come by.