I know that there are some casino workers who know some of the secrets on a casino but I don't think that they will try to help the gamblers from preventing to lose.
On the other hand, most of the workers are possibly clueless on how they can help the gamblers not to lose. They are just mere workers and they will just do what their boss told them to do that's all.

Regarding the anonymity of the worker, I think that they can still share it here if they know it but I doubt that they know or they can help these gamblers in any way. Maybe an advice is the only thing that they can do.