With the bitcoin way, hoewever, the yuan will remain all in the Mainland.  The Chinese citizens will take the "worthless" bitcoins, cheaply made in China, and sell them to foreign buyers for foreign currency.  Some of that foreign currency will find its way in the PBoC coffers, some will be used by the Chinese to buy property abroad.  Either way, the net result will be the Chinese people becoming richer relative to the rest of the world.