US taxes are insane in that regard.
I actually think that’s one good decision they made to prevent tax evasion.
I’m sure Trump will eventually get rid of that though.
But they also tax poor people after they leave, as far as I know, which sucks.
I believe they have to pay other taxes.
“If you are a U.S. citizen or resident alien, the rules for filing income, estate, and gift tax returns and paying estimated tax are generally the same whether you are in the United States or abroad. You are subject to tax on worldwide income from all sources and must report all taxable income and pay taxes according to the Internal Revenue Code.”
From the IRS: https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-resident-aliens-abroad
Maybe my reading comprehension skills are lacking, but it seems to me I am not wrong.