Some gamblers ignore the warning because they are desperate to win bigger money. They make wrong decisions about their gambling which only ends up costing them financially. Greed and inability to control gambling urges are some of the reasons why they gamble with borrowed money, but it is a horrible experience to tell.
I have seen several such cases coming from some of my friends. So far I don't want to tell you much about their gambling habits, but they have reached the stage of make loan for gamble and running away from reality to repay the loan.
Taking loans was meant for the purpose of difficult circumstances, but addicted gamblers made different utilization of this opportunity, gambling and wasting their time on it without any beneficial outcome. Ignorance is another thing that have inflicted so much pain on gamblers, they tend to face the repercussions of their actions which always ends in debts. Gambling with loan money is absolutely wrong and never good proceeds. There's always a negative energy that follows that, the scenario is not basically what we should witnessed.
I think the loan which the OP pertains on this topic are those from the forum lending section by user here. They are not asking loan because of difficult circumstances but rather they just want to advance their salary here in the forum so that they can have fun. I don't see any major concern on this case because they have the means to repay the loan amount on time.
This case is different for those gamblers that loan huge amount of money that is already over their salary because they are spending an amount which they don't have the capacity to pay.