Cash promotions and welcome bonuses have always been a popular way for gambling sites to acquire new customers. But it's worthing remembering that nearly all these promotions will come with terms and conditions attached, make sure you do read them before joining.
Some offers give you a cash matched bonus and others offer free spins but most will require you to making a cash deposit first before releasing bonuses. It's fairly standard industry practice to require you to wager/risk bonus cash multiple times before you'll be able to withdraw it from your gaming account.
I detail any significant terms and conditions which are tied to casino bonuses and free spins.