Indeed, it's a mistake, borrowing money just for gambling is not a good decision and it is highly not adviseable because we don't want to experience something terrible happens once the money that you borrow ended up losing. Think carefully, it's kinda risky to bet the money that you borrowed because how will you supposed to pay that amount if you will use it in gambling and lose?
And if you keep doing that then you will resort on it and it will expand more, I mean when you barrow money for the sake of your gambling then lose that amount then you again will ask for more loans and eventually it will just adds up to your losing amount, it's not good as there are many situation where gamblers unable to afford to repay the loans and they ended up doing unexpected things like doing crimes just for the sake of continue gambling, that's really something which can lead gamblers to regrets their actions, better play and use the amount that you can afford to lose then leave the house if you already lose your bankroll.