Well, on "normal" bank accounts you would be hit by international policies and cover-ups, while on public ledgers, the only barrier is the tech.
Congratulations, you tracked the transaction to a shell company and have no jurisdiction to unwind who the cash withdrawal went to? Ignoring the coin washing services referenced in the story.
There is enough bad guys that are not sophisticated enough and are thinking that bitcoin will do all hard work of hiding it for them.
Obviously they are wrong.