Nobody knows their address or where the funds came from
And people really don't need to know because this is a private address
Privacy is very important
How do you even know this? There isn't and can't be a "rich list" for Monero.
Who knows
There are some people who knew that Monero would take off back when its price
was a few cents. I know some of those folks. Today Monero is still very undervalued
@tokeweed good one yes XMR is probably a good bet