I don't know if the term you beat the casino is correct in the situation you gave as an example. Maybe from the few dollars that turned into thousands of dollars, I can say that you can withdraw it right away.
This can happen to people who only occasionally gamble, with a few dollars in capital and by chance he gets a few thousand dollars, withdraws them, and never comes back. at least, things like this are still quite reasonable and might happen. only, which casino does he play, does it have to be KYC. but suppose it happened.
But in 200$ that became 100k$ because of your gambling win, that's quite a large amount, perhaps, I don't think they will just allow you to withdraw it so easily. Because the gambling management has things to do there, they will screening you for sure. So it's a bit like it's too good to be true, this is just my thought friend.
It's possible, especially if the casino used is a trusted casino. it's just that, maybe to pull it is not easy. at least, there are some mechanisms or requirements that must be fulfilled by someone who wins a large amount, for example $100k as you mentioned. one example, such as upgrading the account level and doing more specific KYC for example.
but really what it boils down to is, is it possible to beat the house. I mean, the scenario is not as easy as we discussed here. in fact, if a gambler has the mindset of beating the house, it's usually the opposite. in fact, a person can spend a lot of money. because after all, all he was aiming for was beating the house. not to get pleasure from every gambling session, regardless of the type of game.