The U.S., alone among the multitudinous nations of the world, asserts that people who live and work outside of the U.S. and have no financial connection to it should pay taxes to it.
These include people who have never set foot in the United States in their entire lives and have never done anything to interact with the United States in any way whatsoever.
These include people who are not allowed to vote for any U.S. office (don't correct me; you're wrong. Some of the people affected by this are allowed to vote, but not all).
It is the very definition of taxation without representation, which one might have thought would be a foundational principle of the U.S.A.
Every single other nation in the world taxes people on their income earned in that country. The U.S.'s policy is an embarrassment; a clearly unjust, illegitimate law.
There is a bright side. The happy truth is that the U.S. has zero enforcement power outside the country and that this edict can be ignored by anyone who truly does not live or work in the U.S.