This is actually the first time I heard this kind of thing since most of the casinos now and new casinos tend to have an announcement thread here or sometimes they ask people here in this forum. So I think this forum is more reliable than other website. People in here are not bias we all know that, and reputation and integrity for casino website is important in here.
There is no question about the forum being reliable but if the crypto-gambling site wants to respond to accusations on their preferred platform, then it's their right and the community can't do anything about it. Although a mass suggestion from the community can be raised.
But by doing that, these gambling sites should be ready for the consequences as it might lead the Bitcointalk community not to trust that site in terms of the way of handling such cases being accused to that site. There's really nothing wrong if the complaints will be answered on other platforms but for a crypto-gambling, it's a no-brainer if the biggest crypto forum won't be considered the best place for a public trial.
If the site has an active ANN thread here, I can't imagine why shouldn't they consider answering queries here.