If the billionaires pack up and move to another country, then those who are willing to pay their due taxes and operate with a lesser profit margin would take the place they left in the market. There is no need to oblige sociopathic profiteers because they threaten to leave.

And, where will they go, really? There are considerable taxes in every country that billionaires would consider. And if they choose to cram into some small island tax haven in the Caribbean, the US can easily pressure that tax haven to do anything it wants.