Re: I may be naive ...
Yeah, that's pretty naive.
They demand payment in bitcoin, not in some transfer that's easy to track. I'm not going to say it's completely anonymous to use bitcoins, but its certainly beyond a lot of police authorities. And they are not going to go to that effort to solve a petty scam either. It's not so much that the cops just don't care about people (although that is usually a good assumption); combined with jurisdictional issues, the technology demand makes it inefficient for them to try and resolve these cases.
And the snoopers at the Fed level won't help. It's not their problem, and they don't want to reveal their capacity to track darkweb activity anyway.