Firstly, he still has to pay capital gains taxes on wealth created before his renunciation. The IPO simply established a market value for his gain. The IRS is still going to get their money.
Secondly, the guy was born in Brazil, he’s still a Brazilian and he’s a now a permanent resident of Singapore living there full time. If he doesn’t want to pay taxes in three countries, that’s understandable. If the guy was born here and then defected just for cash, I might have more of an issue.
No there not...He renounced last year and foreigners pay virtually no capital gains taxes. I guess he saved about $1B in taxes.