The organized at scale (beyond just a gang in a neighborhood) aspect of it requires considerable ongoing capital infusion, which you can only get from a sustainable extraction of economy. It's that pocket of black market economy that is always created by government action, without exception. Every large gang operation in the US rides on top of government prohibition or otherwise preys on regressive regulation.
The war on drugs being the greatest example in recorded history.
Remote Australia is not like the rest of world. It is not easy to supply these places with goods. Doing so illegally is even more difficult.
Those outlying communities are not just relay points in some chain going back to the coastal cities. Like you would get in other places.