Wealthy people aren't dumb - they don't join games where the odds are tilted against them. In these high-stake private games they can usually demand and set the rules like shallow stacks (100BB), enforced straddles, raising stakes after a loss, button games etc. that remove the GTO / poker element and make the game more gambly.

Boring pros who play these games straight up and don't "give action" don't get invited back.

This is how you can have some of the best poker players like Tom Dwan get absolutely wiped out while playing against whales in Macau

If you want to see a more recent example of this - the amateur whale Monarch recently took on one of the best cash game heads up players Bjorn Lee. I won't spoil the result because it's highly entertaining and demonstrates how the game works at these stakes:

https://www.youtube.com/watch?v=PCd7giB9s5U