Dumb decisions bring you dumb results. It's not a matter of what you hope to fix by doing that. Sure, if you suddenly killed off half of the world, wouldn't the other half have better opportunities, space, food, etc.? Would you do it? That would be no, cause you'd probably die first, maybe second. There can be a ton of solutions for a problem with varying methods, and it's up to you to filter out dumb ones from that, regardless of whether you want to help someone or not.

I highly doubt casinos would offer a refund, the image already says it all. They RARELY do refunds, if ever at all. They're a business, not a charity. In the first place, it was the kid's mistake for gambling when he was below 18. It might be grounds for a legal punishment on his side if it ever went to that. If it involved KYC, then boy the one who's identity was used may even be included in the punishment as well.