Well then, one down, a hundred thousand to go
They say (in the linked article) they have proven that crime can be without retribution. So it's a lot easier to do crime with the Internet, well duh. Did they actually think that needed to be demonstrated ?
With the Internet, you are all over the world, but there is no world police. You can create and launch processes from your computer but they can execute anywhere in the world. If that process is malicious, it will hurt someone who does not have any other possibility to track you down except call the police - who cannot do anything because the perpetrator can likely not be found.
It would take quite a few experts to track the origin of a malware, and it would require local law enforcement cooperation to get the details that would allow an actual arrest. That is not something that is going to happen for issues that are less than a few thousand dollars, because it would probably cost more than that to bring the criminals to justice.