As a U.S. citizen, if I make the choice not to interact with the U.S. economy and move somewhere outside the U.S., I still have to give the government their cut. Only way out is to relinquish U.S. citizenship. No other developed country requires this.

So relinquish your citizenship.

Aside from the fact that there's a hefty fee for that, the US government will not let you relinquish citizenship solely for taxation reasons.

You could make up a reason, but that's stretching even your definition of "voluntary" under the law.