Yeah I agree. It's tough, but the people responsible for this need to be held accountable. But the only way that can ever happen is if victims report the crime.

Part of it may be, as another comment mentioned, that reporters often are not believed or taken seriously by police and immigration authorities, and in some cases can even end up penalised. A hard institutional change to make, and I don't have a lot of faith it can be done (police being what they are and overwhelmingly standing up for those with power at the expense of those without). But even worse, even if the change was made here, communicating to victims that they will be safe reporting to authorities in Australia (especially if they might be used to authorities being likely corrupt and unhelpful where they're from). One thing that might help is if we had a guaranteed amnesty from any honest mistakes in the working holidayer's visa status if they contact immigration to allege wrongdoing (with the amnesty holding even if their complaint is not upheld).

I also hope Indonesian authorities crack down hard on any Indonesian residents doing false marketing on behalf of these predatory businesses.