No one touches our winning in our gambling account except people and someone have access to it and the casino itself can't entirely have control of our funds rather they can only freeze our account if they suspect unusual activity. Therefore, it's still important to have our money withdrawn immediately after winning and then use the money for something more productively in our lives than leaving back to the casino.
I don't know if it will be a news but let me break it to you that except for violations rules, the casino has got what it takes from the back end to access your account and do what they wish to do with it but for their reputation they wouldn't but if need be they do, as I have heard of a case where an account was totally deleted off a casino site, although the casino was considered a fraudulent one but they had that access. So don't have the mindset that the casino completely do not have that access as that would be a big lie and probably you deceiving yourself because you may end up disappointed when it happens as some casinos literally have it enshrined in their terms.