As far as I know about 1-3% of adults suffer from a pathological tendency to gamble. It's a clinical diagnosis, so they can't get rid of their disorder on their own no matter how much they want to. They will gamble as long as they have money. No amount of prevention will help them. Only specialists can help such people, and no one can guarantee that after treatment they will not return to gambling again.
Yes, there are players who cannot get rid of gambling addiction on their own, but they probably have no fear of losing money, because if they are ready to play for their last money and then even ready to borrow or take out a loan, then the problem is much bigger and its solution requires the help of specialists. And the fear of losing money in gambling is even better, because a player who is afraid of losing money will have common sense and will stop when there is a risk of a big loss.