Are these loans ever repaid or are you suggesting Bezos/Bill Gates etc have slowly accumulated loans to be paid in some long future. If so there must be some public info. about its stats
I would assume that, yes, these loans are often repaid via other similar loans or instruments that continue to leave unrealized gains as unrealized and avoid taxation. I doubt many multi-millionaires and billionaires publicly disclose or publish the techniques they use to siphon wealth off of society.