Lol, most of these people became billionaires by inheriting already a capital to start with.

I would like to see how you get billionaire with from your 9-5 job having a starting asset of say 5000$. It would take an eternity to build that up to a billion.

These folks already started with 1-10 million $, which is still hard to build to a billion, but obviously easier than from a 5000$ bucks.