Re: Some rich person not interest about bitcoin for following reason
Example: Cz. Craig wright & Michel Sailor etc.
The fact that your "friend" thinks a scammer like Wright has a lot of bitcoin shows how little he understands of the Bitcoin world. They are probably better off not having any bitcoins at all. 
Such people can be easily fooled and be taken advantage of.Exactly. He knows as much as he reads in the mainstream media.
Craig doesn't own the 1 million bitcoin he claims to own, otherwise he would've used the money to pump his SV shitcoin long time ago.
Michael Saylor doesn't control bitcoin in person. It's owned by Microstrategy and that company has a board.
Most of the coins associated with CZ is again owned by Binance, not him in person.
If Black Rock buys bitcoin for the ETF OP's friend will probably say that its another whale owning bitcoin that can dump it all.