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It's like an economic wall that prevents highly skilled people from leaving.

AFAIK this is offset by double taxation treaties. This the case for NL so I assume it'll be the same with other developed countries.

Right, but you can take a foreign tax exemption or credit.

You can make a US tax free $100k in Hong Kong with the exemption. Going the credit route takes what you pay in local taxes and deducts that from what you pay in the US, so in European countries with high taxes, you still don't pay any more.

Still have to file though.