It would generous, if it wasn't for the fact that society dosen't need his money when it can just be printed up as needed. He should have stored it as silver or gold. If he stored it as cypto and we can't find his keys. Then he increased the value of crypto by making it more rare.
If he stored it as bitcoin, then society had to serve him by mining the bitcoin that he bought, just as if he bought something else that is expensive to create.