Ask yourself these questions:
1. Is there any mention anywhere on your sites about responsible gambling;
It would have been nice if you asked in a more professional manner, but I'll respond to your questions.
1.
No. Should a paint salesman provide instructions on how not to eat paint?The ability of a person to make a wager on a future event is not unethical. Many find it fun. The stigma attached to gambling is generally related to puritan religious nonsense, which posits that some activities are "vices" and are wrong. If you hold that opinion, don't hang out in the gambling sub-forum. Freedom of choice is a beautiful thing.
This is really unethical, the compulsive gambling is a problem for many people and should be ways to autoban of a site, is the first rule to follow when you have a gambling license.