How many people get quarter of a million in inheritance or have rich parents? It's silly to call out "self made" just because someone got a loan. Bezos did not inherit billions of dollars, he is a billionaire now. By any metric he is a self made billionaire.
You cannot. But Bezos did not inherit billions and living on them. He is self made, maybe he did not start at zero, but he did 1000x or 10000x (or even more) what he received. If someone had received a loan of 1000 dollars, I doubt anyone would say he isn't self made when he reached a million.
I disagree. The point of the term is not to describe a financial technicality. If someone inherited $900m and worked really hard to earn another $100m, I think most people would be confused to hear them described as a self-made billionaire. On the other hand, of course, people wouldn't tend to be confused if you described some billionaire as self-made if they grew up lower-middle-class and their parents gave them $100 when they turned 18.
So, yes, it's not an "all or nothing" thing, but it is absolutely about conveying relatability to a certain audience. We can reasonably disagree about whether describing Bezos as self-made is appropriate for the HN audience, but I tend to think the $250k "business loan" from his parents should at the bare minimum accompany the inspiring anecdotes about making a desk from a door (which, from what I have read, was literally done to symbolize the imaginary need for extreme frugality).
Bezos' parents loaned him a quarter-million dollars in 1995 [1].
Gates' mother, while on the board of directors of United Way, convinced IBM to invest in MS in 1980 [2].
Zuckerberg's parents sent him to the crazy selective and expensive boarding school Philips Exeter Academy and was privately tutored in comp sci before college [3].
[1] https://www.cnbc.com/2018/08/02/how-jeff-bezos-got-his-paren...
[2] https://www.nytimes.com/1994/06/11/obituaries/mary-gates-64-...
[3] https://www.newyorker.com/magazine/2010/09/20/the-face-of-fa...