That experience will haunt them even while they're sleeping lol.
I've been in a similar position. The regret of winning when you already had your winnings but couldn't cash them out.
But now, that experience reminds me that even small wins are meaningful and can be enjoyed. There's no need to be greedy and keep playing, aiming for bigger wins. Greed in gambling is indeed disruptive, gamblers must learn to control it.
Most gamblers face the same situation, when someone starts winning, they consider themselves experts, lucky. As a result, they lose the money they won earlier in the greed of winning more. Gamblers do not cash out on time due to greed, in fact, the gambler should be careful about what he is doing. The biggest weakness of gamblers is that they cannot control themselves and their greed. Because of greed, gamblers become very addicted to gambling at some point, because no gambler wants to lose their money!