Borrowing money to do business is different from borrowing money to gamble, you can't rely on gambling for anything, it is majorly luck-based. Still, I won't pretend not to know the school of thought you are bringing that from, but that is what those who lost bitterly thought too, they would have had a very big expectation of their supposed skill in gambling, but before they knew it, their hard-earned money or borrowed funds is gone. What a pity!
If borrowing money for a business is still reasonable and indeed many people who I think are building a business borrow money either from people around them or from official parties such as banks, but borrowing money for gambling is highly discouraged and unreasonable, because this uncertain victory makes me think there is no point in borrowing money to gamble because it is possible that it will only make us lose money.
Even if they have good skills in gambling such as having good knowledge in the types of sports betting, borrowing money is still the wrong action, it is excessive behavior in gambling. I would not do it even though I like to gamble.