This is why no matter how little our wins are, we should be satisfied with it and quit the game because if you are not satisfied and want to win more, you will end up losing it all back to the casino. This is why gambling should be done with caution and reservation, so that you don't end up like the guy in the OP.
The funny part is that gambling generally doesn't care or reconsider one finances whether they have lost miserably with their big money or once won big before they begin to lose terribly. However, gambling doesn't care about those things because it is programmed to be open for your stakes.
However, If you as a gambler don't advise yourself on how to take precautions or be calculative on how to gamble less, your money will be siphoned without pity or consideration by the gambling site because they never force anyone to gamble with them. You choose to gamble with them willingly