On the surface it seems easy enough; but after being here a while and seeing the elaborate lengths people will go to I can see why the forum would wash it's hands of it.
On the flip side of that they do not moderate anyone calling out scams. Everyone and anyone has the ability to shed light on anything that doesn't seem above board and a discussion can ensue.
Is red tag from DT enough ?
It should. This is a bright red mark saying "look at me". The feedback should have a reference. If this isn't enough to make you want to deal elsewhere then I don't know what to say. Note there are usually many other options available...some of them even legit.