This is also literally one of the most complex, relationship-based, and opaque to outsiders communities on the planet. Try to wrap your head around the unimaginable clout and favor calling that this took to develop. "Exclusive" is an understatement. Nobody has free access to something like this.
It's basically the Chinese version of hawala except with drug dealers. A number of ethnicities have developed informal value transfer systems. Pretty sure it's well documented that everyday Argentinians use systems like this for getting money out of Argentina.
