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One is that they're already tired, and they understand that they will never win against the house. That's why they're stopping gambling and spending their money on something they will benefit more from.
Next, when a gambler wins a lot. While it's hard to control greed and hard to cash out when emotions are high, there are still a lot of gamblers who are disciplined.
Lastly, when things get worse and they do unnecessary things just for the sake of gambling. Family is being affected by it and due to that, relationships are destroyed so they end up changing themselves by stopping.
Yes, it becomes regular habit even after you find yourself winning more, being disciplined is the key here, same happens in trading, people blow up their accounts, just like they do gambling.
The dopamine hit from wins is to be enjoyed momentarily but not get the hang of it. Awareness regarding responsible gambling is necessary these days.