There are some casinos who plan to scam gamblers when they get big wins. They look for various types of faults of gamblers early and when they find those faults, they can easily block the withdrawal. Complaints of account blocking of some users have also been heard. These situations are faced only when the gambler gets a big win. And the gambler cannot get any information in advance about such a situation. So before gambling you must choose the right platform for avoiding such situations.
Do not be disappointment if you have a small win and a casino, sport betting site or other gambling site do not want to release your money for you unless they have checked your account and make sure that you do not violate the gambling rules. This happen most especially if you have not withdrawn money from the fambl5site before. It is not about only big withdrawal, also slamm withdrawal.
What I noticed about big withdrawal is that sites that do allows their customers to gamble and withdraw without KYC will request for KYC before the person will be able to withdraw. If you check their terms of service, they will have maximum withdrawal amount for no KYC customers.