Still a long way to go for authorities to catch up with this criminals. It's either state sponsored, which is likely very hard to arrest, or just a couple of group of individuals who's motive is to steal from unsuspecting victims. The legal system though of the US is complicated, I mean he could just point to the person in Australia and become a while blower to save face and he will likely be getting a light sentence. And this is just a drop in the ocean, as we all know that cyber criminals are being born from around the world, and target not only cryptocurrency, but everything their hand can get to make money and uses the data that they will get as a ransom.
Yes, we all know that, cyber criminals are very smart, however, smart as they are, they are bound to slip. And that one mistake will lead to their arrest. In this case, he did talk to undercover and it was just a matter of time before he will get arrested.
Unfortunately, this is a very common way of selling illegal software that allows you to spy on the victim’s computer and steal all files and entered passwords. But the developers do not sell their software to unverified buyers, so most likely it’s a stupid intermediary who wanted an easy way to make money.
Yes, the intermediary that slip up, he is so stupid that he didn't know that he was talking to the authorities as well. Maybe it was the look of the $$$ that is in front of him and so he let his guards down. And it lead to his arrest.