This is the reason I have not preferred to leand money from bank, also other places like online lenders, they have high interest rate and the longer the time the money is not paid, the more the interest. It is highly unwise to borrow money from bank to gamble.
I also try not to borrow money from the bank. I once got an offer from the bank by paying a small interest for a long time but after I recalculated, I found that the refund amount was bigger than the amount I borrowed. That's why I don't like to borrow money from the bank because the bank will get a very large profit from that interest.
That is if they will gamble without any experience and will only try their luck for the last time but for the op, he seems very confident to win the game because he got an insider info. He can try to take a loan and see if he can double or triple the money in an instant. He just want to make sure that he will pay the loan that he take immediately before he spend the money again in gambling because his luck may not be the same as last time.
For those who loan and use the money on other things and not in gambling, I think that's more better because they will surely see what they spent not unlike to gambling where there's no guarantees.
But the risk will still be there, whether he can win the match or he loses later. And I think he can get a loan easily, but he must be able to make sure that he can return the loan no matter what results in he gets later. Many of those people did not think about how they could repay the loan money. But they should think again if they want to use the borrowed money to play gambling because they will have a greater risk of losing.
Loaning from the banks will really cost you so much because they have high interest rate. Most of the time, the money they lend you will even be lower than the interest you are going to pay especially if you plan to play with long duration.
Regarding loaning just for the sake of gambling, it's really risky. Because despite having a tip of a fixed match, there's still a possibility that you'll lose if the tip turns out false. And if that happens, you'll lose the money you borrowed instantly. If ever someone plans to borrow money to bet, they must ensure that they can pay the amount regardless of the outcome of the bet. Otherwise they might face so many troubles later on.