Op to be honest I still don't understand what you mean by illegal casino, because most people term casino illegal probably because of the fairness if they loss too much they conclude that the casino is a scam, or are you talking about those casino that refuse to abide by the government rules and somehow make their services run and benefit from the citizens without the government's authorization, however if this is the case then the promoter have nothing to do with it the gover can just make their fine and keep those innocent promoter alone who only did it because they got payed.
By illegal casinos he means casinos which don't have the permission from the local government to operate inside the country. Therefore, there can be fair and legit casinos among them. So, I don't think in this case promoters are commiting any mistakes. It's the government which is persecuting them for financial reasons (the government doesn't profit from the so called illegal casinos).
To make things clearer for everyone who is applauding the government, just put yourself on the promoters' shoes. It's like the government forbade everyone here from making an income through signature campaigns, because we are promoting illegal casinos, accordingly to our local jurisdictions.
Would it mean the casinos we promote aren't fair or legit? Of course not!