[toomuchtodo]

Denaturalizing and revoking citizenship would be the least worst outcome assuming the US government tires of someone providing an enemy nation state material support.

[solardev]

Would he even care? Probably a few dozen other nations would be happy to have him and his wealth. Billionaires like that exist outside the national borders that you and I live in...

And plus, he probably still has South African citizenship?

[fakedang]

He would definitely care if his assets were frozen and his companies nationalized, or at minimum, divested to another set of investors.