When you are playing Free Roulette (a demo game or a simulation), you can’t win real money. Free Roulette and other casino games are likely to require no registration and, as the name suggests, no deposits. To play Roulette for real money and win in Australia, a gambler usually has to sign up with an online casino, create a new account and make the first real money deposit. The only exception is when a player has successfully claimed a No Deposit Cash casino bonus. With the promo, they have a chance to win some money. It is just a chance, not a sure thing. But in this case, you are not playing Free Roulette: you are playing real-money Roulette (you have registered, created an account, and chosen a deposit/withdrawal option before claiming the bonus), and you are not paying anything because you are using a casino bonus.