You always have to register and sign up for an account at a real-money casino in order to claim free spins bonuses. The registration is quite a speedy proceed. You only need to supply some personal details including your email, your address and age, and then to verify your account in order to get your hands on the free spins.
If you do win a sizable amount and succeed in meeting the wagering requirements, you might be asked to make a deposit or else to send a copy of your passport in order to withdraw your cash winnings.