Agreed. If this were just a glorified yelp review of poor customer service, then thanks for the feedback- noted.
If it were a claim of a crime without evidence against a vendor, then baseless accusations shouldn't be supported and the post should be deleted- we don't want to support grudge matches that should be handled privately.
But if the OP has a paper trail of a crime, then that's worthy of community awareness as a cautionary to others.
edit- per my comments above, I do need to ask the uncomfortable question to the OP
@Vasigan - although the reputation of Kostas is well known in this community as being shady, do you have a paper trail showing that he commited a crime or that you entered into an agreement with him by which he didn't fulfill his end? Not trying to cast any doubt on your side of the story, but if this community is going to pile on- the claims need be substantiated.