I can't possibly decipher your first statement bolded above, what could a winner's possible fear after winning, to have warranted regretting even after then?
However, your remaining part is accurate, it boils down to gamblers to first learn and know it and then acknowledging whether or not they are fit for it. This self-assessment could have saved a lot of losers who are devasted by gambling because gambling is simply not good for everyone, they will never be able to give it all it takes, but instead, it impacts them negatively.
Yes, that's right, bro, when we want to gamble, what we have prepared is capital where we have accepted all the consequences, whether it is a loss or a profit, when we start gambling, it means we have accepted the loss of money that we have spent for the initial capital of the game.
So there is nothing to be afraid of, when we are afraid of losing our money, it is better not to gamble, divert our money to invest, it is good if it is profitable, if it is a loss, it is the same, it all comes back to each of us, how clever we are in gambling wisely.