The loan money is not the correct source for the gambling game,the gambler should allot the separate source of the income from the salary like 10-30% of their salary to their own games in the gambling site.The gambler who keep their betting in the one game will become the millionaire one day with the help of the same game and the gambling site.The trusted gambling site alone help the gambler to make money in their website.The self confidence was the key for the gamblers to make money in the gambling site,the loss is always their in gambling site.The gamblers also look to the opportunity with the loss in the gambling site.
The idea of allotting a certain amount of money to gambling monthly or weekly depending on the individual is actually a very good idea but then the problem I'm having with your idea is the percentage, because if you understand that gambling nis actually for fun and entertainment and not for making money primarily, which means it shouldn't be seen as a side hustle either.
Allocating as much as 10%-30% to gambling monthly or as the case maybe is actually too much, that should rather be the kind of allocation you do to investment and not gambling but we make the mistak of give such to gambling, gambling is basically supposed to be entertainment so 1%- 10% should be the maximum because it's actually an amount you are putting at risk and you are not certain yet about the possible outcome of such money so you shouldn't be risking that much so you don't have to regret.
If we spend more than 20 percent on gambling on a monthly basis then I think it is not in entertainment level. Because if a person invests 20 or 30 percent in gambling then he will definitely express his desire to make more profit from it. Which in turn may lead him to loss rather than gain. And if 10 to 15 percent is used it is definitely acceptable. A gambler will have big financial problems when he spends more money. At some point he decides to manage his gambling by borrowing money to solve his crisis. Which in turn will lead him to a terrible situation.