If the government takes it, what are they going to spend it on? Foreign wars, jails, lavish mansions for leaders?
But quite honestly, if somebody makes a successful business, wise investments, or works their ass off building an empire, who's to say they can't enjoy all the wealth they've brought in?
Bezos may be filthy rich, but because of the countless hours of work he put in (don't tell me he didn't work nights and weekends while his employees worked 9-5) so you can enjoy groceries on demand, 2 day delivery on almost anything you want, and great video streaming. Stop using the services he created if you want his wealth to go down.