Net worth tho is a far cry different than just his checking, savings, and investment accounts. It also includes his stake of Amazon which of course is a massive company that would set records if ever put up for public sale
Heck, by net worth, I think my middle as middle class gets parents may actually be millionaires. They're approaching retirement, Dad told me. He's taking the 400k pension lump sum payout and mom is taking the monthly payments which would be worth around the same over the years. Add in they'll be done paying off and own their 250k house by end of next year and that all adds up to millionaire by net worth
Work 30+ years for a company, pay off house in that time, and that results in millionaire net worth so I'm not surprised net worth of the owner of the most successful company since Microsoft and Apple has the level of wealth he does wrapped up in it