LOL, speaking or typing from my personal experience now, it never ends well for those who win a very big amount of money, and then go on to still continue playing with the money they won, most will end up gambling and losing the entire amount, and might even proceed to make a deposit and still lose it too.
This is exactly what happened to one of my friend, a very good friend of mine, won over $300 dollars in our local currency on a local casino, unfortunately, it was on a weekend, that is on Friday night, and the casino does not pay winners on weekend, they winner will have to wait till Monday before he or she gets paid, so my friend was told to wait till money to get paid.
Long story short was that, he started gambling and betting from the money he won, and before Monday morning, he has already lost every thing back to the casino, it was an unfortunate experience for him as he regretted this seriously.
So based on this , i will never advice any gambler to tour that same path.
Yes, what might happen if a gambler who wins a big win continues to gamble will experience a very big loss and lose all his money. That's an example and probably unnecessary because when a gambler manages to win a large amount of money, they will immediately withdraw and leave the casino.
As long as the casino can pay your friend's winnings, your friend is better off waiting and not having to continue gambling. But if he continues gambling and loses all his money, it is useless to him and he has really lost all his money. He still wanted more money so he continued gambling but he didn't realize that he already had more than enough money. Greed is what ultimately makes someone regret what they have done.
No the thing is that, as an AML compliance rule for financial licensing, any funds into a personal account which go above $5000 must have to go through verifications and at that at some point a gambler who's transactions go above the threshold will be prompted to go through kyc and an anti-money laundering measures, there is no two ways to that and at such you have to go through with that or operate within the set limits that are set by various casinos and other financial service providers.
I don't know what limits a gambler can reach when depositing and withdrawing money. Maybe $5000 or less, but the verification will come to him if he ever exceeds the limit. That is why one can deposit less money to gamble and should be ready if the casino asks him to do KYC one day. That means we have to pay attention so that we don't have to do KYC even though it might later be applied to all gamblers in the casino.