You have the current unicorns, basically anything from about the time YC started, and then you have the old school unicorns.

For comparison, Microsoft IPOed in 1986:

> The company's 1986 initial public offering (IPO) and subsequent rise in its share price created three billionaires and an estimated 12,000 millionaires among Microsoft employees.

https://en.wikipedia.org/wiki/Microsoft

I would really, really want to know if anything more recent has gotten to that level of widespread distribution of the riches.

I kind of doubt it, such an event would probably be considered Communist by modern standards :-)