You are right but such a scenario is very uncommon, after all at that point greed takes over those people as they think that if such results can be maintained during the long term then they could make gambling their main occupation, so they gamble again thinking they will get the same results only for things to change and experiment some heavy losses, then instead of simply accepting that their results have gone back to the mean they gamble even more money, and that is how they end up returning all of the money they won to the casinos.
This is the most common mistake when, after a long series of failures, the player tries to increase the amount of the bet and thereby hopes to win back the loss. But this only means that the player turns on emotions, and it is clear that in this case the loss is inevitable and it will be a more significant loss. Even if this time the player is lucky and wins, it will be even worse because he will think that he can win back in this way, and as a result, he will return to this method again and again until he loses all the money.
Not only when they lose a lot of funds, but also when they win. They have the mindset of "I won a lot so it would be okay to bet a high amount of money" then after losing that money will lead to that scenario. Hoping that they could win back the money they lose but betting a huge amount of money would just cause them to lose more. Also they have the mindset of "high risk, high reward" but without consistency and limit to themselves cause them to use all of their funds. Always remember that having a winstreak doesn't mean you will not stick to your consistency.