The offers are designed in such a way that it will be difficult for most gamblers to withdraw their money. I am generally not very enthusiastic about using bonuses because the conditions are complicated. Especially when you think you will withdraw your money, those restrictions are visible. Some casino platforms offer very high bonuses to attract users but their wagering conditions are more complicated. That is why it is not beneficial to only pay attention to the bonus, so one should also be aware of whether the conditions that are achievable or not.
It is correct that all the gambling sites' main target is to add as many users as possible, and to serve that purpose, they offer as many bonuses as possible, and they want customers, but those who offer more bonus may give some kinds of restrictions sothat they might not be loser for the offering bonus. Because finaaly they need users as well as profit.