I have less of a problem with a 100% (or very high) income tax for income over $1B because it's at least still an income tax. If a wealth tax is enacted, it may start at $10B but you can be sure it will be gradually lowered until it is not just affecting billionaires.
I agree with the other comment though about giving it to the US government. Don't like that idea at all. I'd rather divide it up so each citizen gets a cut, equally. The government wastes so much money that giving them more is never a good idea IMO.