Unfortunately I think the way the law would look at the disclaimer is quite different. It admits that what you present is not legal in some places. It still affords a person a chance to use the information even if it is illegal to do so. Therefore you are contributing to the crime by enabling the person access to the site. This is what the porn sites have had a problem with and why net nanny and other measures are used to stop minors from accessing porn sites. A disclaimer on a site that is an attractive nuisance won’t save your ass if they find out minors have been using it. I think the same would be true if they found gamblers were using it to get information from places where their activity was illegal.
It is sort of like putting up a sign that says beware of dog. It is admitting that the animal is dangerous and won’t stop someone from successfully suing you should the dog bite that person, even on your property. Also similar to putting up a sign near a swimming pool. It is an attractive nuisance and if someone is injured or drowns you may still be found liable to some extent.
Granted this is just my take on this deal, but considering my recent experience with the local law in my state I don’t have much faith in them thinking you were trying to do the right thing. DA’s are just looking to hang you and will put any spin they can on the thing to serve their own needs. They may know that they don’t have a strong case but will make you spend thousands to defend yourself in hopes that you will take a lesser plea bargain. They look real good because they get a conviction on a lesser charge but its still a conviction and you have to take it because they will ruin you financially and there is always the slim chance they might get a conviction. I have first hand knowledge of this.