> The US government is so powerful, they are the only country that enforces a draconian global taxation scheme on any citizen or person who has ever held a US green card […]

While it may be true that they are the only ones able to do it effectively, there are some other countries with citizenship-based taxation. According to Wikipedia[0] these currently are: Hungary, Eritrea, Myanmar and Tajikistan

Some other countries have similar policies for tax heavens.

[0]: https://en.wikipedia.org/wiki/International_taxation#Citizen...