I think its wrong to manage ad campaign and try to keep the members from knowing truth about business they advertise for.
Every accusation against betcoin is backed up with evidence.
Well, IMO posting that in their signature campaign is not right. From what I see there is already an on-going scam accusation against them to which they are not responding to. If there is adequate amount of evidence, then it would be best to contact people from DT as they might mark the service (if they have an account) or the promoted with negative trust.
Note: I have not looked closely into the accusation and can't say whether it is valid or not.