This proposed tax is an EXTRA tax on billionaires only. The “all taxation is theft” position is pretty indefensible in modern society, but this explicit “No, fuck you in particular!” tax is ALSO indefensible.
That is a hole we could fix tomorrow by eliminating the step up on death. No need to introduce a new global financial surveillance regime for tracking asset ownership for wealth tax purposes just to fix that.
Fuck billionaires. The fact that individual people possess so much wealth is poisonous to society. It is the easiest thing in the world for a billionaire to become a not-billionaire and they will still be stupendously wealthy.