Someone thinking they need 40M to escape the "anxiety about the cost of living" is not just a personal decision. It is either extreme greed or delusional. He makes money doing Roblox he is the "laptop class". If you make 400k per month and can't afford to live something is wrong with you. Let's not conflate parents struggling to support their families with whatever this kid is doing.
For reference a worth of $40M puts you well within the top fraction of one percent of all Americans, nevermind the world. If anything given his age it is probably more likely his wealth will become a liability for him rather than an asset. The trope about people who come into that much wealth that young and it creates problems for them exists for a reason. Staying at his desk cranking out more Roblox products might be the best way to keep him away from becoming the victim of his own success.
Anyway good for him. You're right there is a lot of anxiety out there. On some level he should rightly get as much as he can. But let's not pretend you need millions and millions to be safe. We should be working to change that anyway, not merely celebrating massive outliers. I assume since you care about struggling families so much you support his taxation so some of that money can go to people or communities that are struggling? Or since you seem open the idea he needs 40M to survive perhaps you think the government should keep their hands off?