Well, I just got back into bitcoins, and figured I'd use Bitcoin Blender again, so the first site that DuckDuckGo comes up with in a search had this URL:
http://bitblenduun5mnwp.onion/index which is apparently a scam site. They took $200 from me, at a time when we really couldn't afford to lose that. So far, there are at least 2 scam sites that I've found.
The most important rule in the web is to always be aware from scammers. As to be twice aware when using darkWeb services. Bitcoin Blender is one of the most trustable service in Tor-hidden web if you check twice the URL (bookmark it) after getting it from its official channels.
It would be important to post every phishing URL you had discovered to warn newcomers users about it.