Yes but this is by design. Wealthy people want bubbles, when they pop, you can gobble up all the value at all time lows. Then you hold until you don't feel like it anymore as the market goes back to growing. You see this as how private equity has bought up real estate across the USA to turn into rentals after 2008, for example.
There was an article here recently about alpha school that mentioned this is how of of its backers made a lot in the aftermath of the dot com bubble - picking up companies with products that happened to implode in the bust. He's not the only one and that's not the only bubble that had that happen
Aren’t extremely wealthy people that wealthy due to the valuation of their stock? IIRC generally the higher the networth, the higher share is kept in stocks