The fact is there are a large number of venues where you can trade either tax free or virtually tax free. There are also corporate and other structures that exist to get to your goal. BUT NONE OF THESE VENUES OR STRUCTURES COPE WITH THE FACT THAT US CITIZENS ARE OBLIGED TO FOLLOW US TAX LAW OR POTENTIALLY SUFFER CRIMINAL PENALTIES. Why bother focusing the conversation on the laws of other jurisdictions? Unless you are prepared to solve the problem created by your US citizenship first it is too early to look at the pretty pictures in travel brochures.