Bernie/Warren wealth tax was a good idea in my opinion. It would increase Bezos's effective tax rate from 0.1% to 3%.
Bezos's net worth still would increase every year, as the normal capital gain is 8% per year and it is much higher in Amazon.
There are also nasty effects with start-ups stocks or options that may be worth quite a lot of money but you may not be permitted or be heavily restricted in selling the stock even if you execute the options. There may still be a possibility of the stock going to zero leaving you with a large tax bill and no value in assets.
It is hard and not perfect, but we can't have everything based on income for high net worth people, they won't pay their fair share and keep getting richer and richer.