Intelligent scam casinos will allow you to withdraw small amounts but when you deposit big (because you gain trust by withdrawing small amounts), they will not allow you to withdraw and make excuses not to withdraw. So do not remain in this that since they allow small deposits. they will let you withdraw any amount.

The only way to avoid this situation is to play only at the already established trusted casinos. There you do not have to take the tension of your deposits and withdrawal because those trusted ones will never held your amount. As their business is very expanded, they do not need anyone's few hundred or thousands of dollars, they are already getting enough profit by running a legit casino.