Well, the money they made in that country was the result of services they provided to the people of that country. The country already benefitted and to lay claim to the return they got for doing that is to say that they were slaves when providing such services. To put terms on the use of what's presumably theirs that they've earned is to say "you're not the owner of it, and you're not the owner of yourself either."
A wealth tax is "you did great in this country, and you brought wealth to the people here such that they paid you for what you've done, and that's great. If your continued relationship with this country is valuable to you, we are going to need a cut of that as long as you want to maintain that relationship but if it isn't worth it to you, youre free to end that relationship." Still, to me, the nation-state level of scumbag behavior, but at least nobody is being held hostage.
A wealth tax is "you did great in this country, and you brought wealth to the people here such that they paid you for what you've done, and that's great. If your continued relationship with this country is valuable to you, we are going to need a cut of that as long as you want to maintain that relationship but if it isn't worth it to you, youre free to end that relationship." Still, to me, the nation-state level of scumbag behavior, but at least nobody is being held hostage.