i really want to know where you got that figure, because a quick google search does not verify a median inheritance of 70k. there are some figures which report a mean inheritance of around that, but most are significantly lower, and this document suggests both that the median inheritance is around 8k across income groups, and that less that 7% of people are will receive any inheritance at all when averaged across all income groups. (the wealthier you are, the more likely you are to receive an inheritance).

and sure, most people who start a business can take out a loan, but there are a vast quantity of people who can't take out a loan, because they have bad credit, or do not want to take out a loan they know they will never be able to repay if they fail to get their business off the ground. rich people can afford to take more risks, can afford to not spend excess money that they have on making sure they get to eat next month, and thus are conferred specific structural advantages when starting, maintaining, and growing businesses.

i'm not saying that 28k can automatically turn him into a billionaire. i'm simply pointing out the truth, that Elon Musk did, in fact, benefit from structural advantages which cleared barriers to entry that the vast majority of people do not have the resources to bypass.

i get that people would really like it if he was some rags to riches story about a poor kid ascending up the ladder, but no. it isn't true about musk, and it isn't true about most billionaires. their wealth is unprecedented, sure, and they have leveraged their resources beyond what most people can conceive, but it bears repeating. statistically, most of the monstrously wealthy started out wealthy, had access to resources that the average person will never have from the start, and were only in a position to grow their wealth because they had money to burn on things other than food, shelter, and physical health.