That's a huge part of savings for someone supporting their family, but the word "savings" is what caught my attention here, see, not "earnings", but "savings". I think it means the guy is living with his parents, saving little by little from what he's getting for small expenses. I may be wrong of course, but then the guy should probably reconsider his budgeting. Spending 20% on gambling is unacceptably a lot.
For me, 20 percent isn't that much but what only bothers me is that he used his savings there. If he don't have other sources to get a money then he better not gamble because that will only add up on his expense and if his goal is to earn money then it's also not guaranteed.
Better if he look for a job first and that is the one he should used, not his savings because savings has its own use case, mostly for the future e.g. when we retire or if we want to give our kids a better future. It's not also good to depend on our parents because our parents might be old already but we are the ones that must work and we must return what they have done for us once we are still a kid.
Same here 20% isn't that much. Let us say my weekly savings is around 50$ so that makes $10 an allocation for gambling. In a month's time, I would have $200 savings and $40 of those would be allocated to gambling. $40 a month for gambling is a small amount in my opinion. Other players gamble more than that in a week.