If someone borrowed money for gambling, and then doubled or tripled it, they can celebrate, of course, but it is very important that that person know that borrowing money for gambling is still a big mistake, regardless of the outcome, or, otherwise, they might be stepping on a very dangerous path, thinking that if they borrow more they can win more. If it's already in the past, okay, we can't change the past, but in the future it must be an absolute rule that you never borrow money for gambling.
At the end of the day, It all boils down to the fact that using money you can't afford to lose(whether it's your money, borrowed or a relative/friend's money). It's not advisable to gamble with it. I know how eye catching these casinos and betting platforms can be. But before gambling, I always think of the possibility of it going the other way round and I think about the consequences when that happens.
In life, good measurements of risk and reward is always helpful. I'm not in anyway saying that taking risks in life is bad. As people always say, too much of anything is bad. Same goes for taking risk.