Someone out there must have settled their debts using gambling, it's not impossible but it's stupid to think this way because the chances that things will work out well is low.
You can gamble with the hope to settle your debts but end up losing more money, this is likely the outcome and that's why I will never recommend such strategy to pay your debts.
What he needs is a job, gambling won't safe him from that debt, he can even end up chasing endless aim that will create more problem for him, debts are best settled with salary.
Although, you might be right, someone must have try to pay up their debt with the means of gambling. But, that doesn't give people the context that it will have to work for everyone, rather than thinking of taking this path and putting themselves in a more stressful way, they should set plans that will be of help to them and stick by it because that way also helps to tighten their discipline and keeps them in control and that way they can win over addiction and even find a way to pay up their debts.