This is one of the disadvantages of offline gambling: when you are gambling with those who are stronger than you and have the upper hand, you cannot just win them and quit gambling. They will make sure all that you have won from them is also won back from you, and you can also spend even extra, because they are not regulated and you can't make some kind of decision on your own, and if you disagree to play, there can be some kind of conflict.
It is very dangerous if you play offline gambling, especially if you are not familiar with the place you are gambling, because later on when you are winning you may not know that other people around you are already watching you.
Then when they let you leave because you thought you would go home with a big win, someone is already waiting for you to take your gambling winnings, which you are also unaware of,
one of your opponents in gambling is also an accomplice of those who were waiting for you. This is just one of the scenarios that can happen.