Are there even casinos that are actually organizing Ramadan gambling events? I don't think there are. Why would they even offer such events when it's widely known that gambling is prohibited in Islam?
But it's a different story if Muslims are gambling. It's their fault, not the casinos'.
You posted that in Islamic religion, gambling and betting are seen as Haram. Gambling sites also know this and they avoid to relate with Muslim's festive celebrations. Or am I not getting it right? I have not noticed anything like that before.
Christmas and the Easter celebrations are symbolic for the birth and death of Christ, the Casino's know this, and are also aware that gambling is a sin in the religion of Christians, but they still do not fail to bring up Christmas and Easter events. Are you saying that Casino's are religion sensitive?
Gambling isn't a sin in Christianity. That's what I know. As far as Christmas is concerned, that has become a secular celebration. Many people who aren't Christians are celebrating Christmas seasons.