People are ignorant on how networth works, most (if not all) of these billionaires
wealth is nothing more than unrealised gains from their shares/company, they don't actually have access to quick cash that's why their networth is always fluctuating and why the likes of Bezos and Musk take out loans or sell a portion of their shares all the time for big expenses like space missions,twitter purchase, yatch etc
I promise you the majority of the properties purchased in Billionaires row in central park, for example, were loans taken out with unrealised gains used as collateral