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Just hope that from Free Spins, you can win a lot of money and withdraw the win money so you can get real Free money from the casino and use it to deposit on the other days.
But it is rare to win from the bonuses and maybe for some people who have big luck, that will happen. At the same time, the rest of us will not get it and needs to deposit more before we can win some money.
Normally bonuses come with a lot of rules and requirements and most times players may fail to meet up with those requirements and will end up losing against the House if care is not taken even the player's deposit will be lost along with the bonuses.
Not all the time, I played with the Moonbet recently and I managed to win their deposit bonus and able to withdraw it. For me they used it to attract players although some of them have difficult requirements probably it is to avoid abuse and also for the safety of their business, no one will run a promotion that the users will likely to win.
Gambling site/platforms are businesses which its understandable that they would set out hard or close to impossible kind of mechanics or requirements for someone would able to withdraw out out of those bonuses and you are somewhat lucky that you do able to manage to win and able to pull off some withdrawal which majority of gamblers do really fail to do so.
Its one of the ways for them to hook up players specially newbies but once you are aware on how these bonuses work then you wont really get excited for it on next time.