Yes, but unfortunately the person did not have the understanding that you mean, so instead of cashing out and enjoying it, what happened was that he continued and eventually lost all the total amount that he had previously won. And this is someone who is included in the people who are too greedy and do not realize the risks that lurk.
On the other hand, I am also quite curious about whether it was a new person who came to the store or a gambler who had subscribed or had often bet there, but at first glance I think he might be a new person who came there, because if he was a regular customer then he should not have run away, at least he said something to the cashier like he owed money and came back again someday to pay it because most likely the cashier must have recognized him. Regardless of whatever it is, I think in the end this is a valuable lesson for the cashier to be more vigilant and careful, and of course this is also a lesson for the store itself to improve security.
What happened here is simple: this person, new or not, got greedy. Thinking their fortune would endure always, they fell for the oldest scam in the book. That is basic, plain terrible decision-making not just greed. Though its a dangerous delusion, easy money can give anyone superhuman abilities.
Regarding new vs regular gamblers, casinos have to raise their game now. Their responsibility is to acknowledge whether someone is in distress, new or not. This is about shielding people, not only about security.
They should notice these trends using their fancy technology since they own it. Using data to create money and keep people safe is what I define as smart business. The cashier may have been the one to deliver a reality check and halt this. In this sector, we need leaders of the kind that you describe.
Yes, of course the problem is that the person is too greedy and does not realize that luck will not always be on his side until finally regret comes and runs away because he does not have that much money to pay for everything he has done there. Previously I was sure that the intention of his arrival was probably to gamble moderately, meaning gambling with the money in his pocket, but over time he got carried away because he was too sure that a much bigger win would happen until finally when everything was lost, that's where various bad decisions happened that made him unable to pay all the bills.
Good point with the idea of being more considerate of the customers who come and also trying to get the customers out of trouble, but I think in a festive atmosphere it is very unlikely for some staff to always pay attention to a player, and sometimes there are gamblers who are dominated by emotions but do not show any reaction, and I think the issue of whether someone is having trouble controlling themselves or not I think it is not the casino's business my friend, I think it is purely the responsibility and business of each individual, the casino only provides the game and makes sure that the situation remains safe without interfering too much with the game being played by the customer.