So, you're saying; Saverin owes us. Is that correct?
Morally...I think he's a freeloading bastard, and I look forward to the day he goes to jail in Singapore for violating one of their numerous and extremely punitive criminal laws. But I do not think he has a moral obligation to pay additional taxes if he has satisfied his legal obligations.
Morally, the United States is full of free loading bastards who know every single loophole in the tax laws. Why single out this one guy? Because it's much easier to focus on a single individual and crucify him? He's hasn't done anything different then what other "free loading bastards" have been doing for years.
This is guy is not a born US citizen in the first place and he's been living in Singapore since 2009.
Sure you might not like the guy, but when you're hoping bad things happen to him just because he's about to make a lot of money makes it look like you're awfully jealous of the guy.
It's also amusing that you denigrate Singapore for their "numerous and extremely punitive criminal laws" when the incarceration rate in Singapore is roughly a third of that in the US.