The exception I take with your assertion is that every single person that engages in gambling does so voluntarily. The casino isn't forcing them in. The casino isn't stealing money from them. All these folks are playing a game with odds easily researched.

A casino advertising, highlighting wins, etc. doesn't change the rational's prior on the odds of winning. I am fully against regulating people's freedom to engage in commerce when that commerce isn't harming anyone else, and I don't consider advertising a third party externality.