

Every country would need to adopt a universal taxation of wealthy individual for increased taxes to work. What I am saying is if US has a 75% for those earning over certain amount. Then other countries have to do the same. If not then Billionaires will run/relocate to the cheapest taxes. Which would be easy since the country they move to will be happy to get Billionaires tax money.
That is a slippery slope. If a millionaire is approaching that certain number. They would just leave before it hits their bank account.
What you are describing is straight up Nazi type tactics.
https://www.smithsonianmag.com/history/1938-nazi-law-forced-jews-register-their-wealthmaking-it-easier-steal-180968894/