He was a Bitcoin miner
As well as a software engineer and he basically had a lot of Bitcoin and is believed to still have it
Naturally, if you have $500 you don't spend it all. Spend a maximum of 50,100 dollars. The same is thought in his case
However, to avoid taxes, risks, becoming too famous, theft, etc., he basically doesn't come to any interviews (very few) or doesn't express himself that way

And he himself once said that he has no regrets about it. It means he has a lot more than that 😁

Very Brilliant Guy! ❤️