Comment by sardonicbryan

I think the intended usage for this spreadsheet is more along the lines of "derived," as in where does X derive their current wealth from, or "What current holdings qualify the person for this list." Otherwise this table would involve an order of magnitude more research and editorializing. For example, Elon Musk has "Tesla" listed as his source even though as we know his initial wealth came from Paypal. At least, that is the usage that seems to best fit with what's in the spreadsheet.