Gambling does have issues. ALthough epople are free to choose and do, there are some people who have addiction to entertainment and other things, like gambling, drugs, etc., and this reduces their quality of life and condition of living by sucking their time and attention, and in some cases like gambling and drugs, much of their money.
Simply because people can do something in an form of "free will choice". Many people are in a low consciousness modality, and need help. Having a business that simply offers a "choice" to assess risk and possibly make money voluntarily, does not take into account the state of consciousness some people are in and how these forms of entertainment hinder their progression to "heal" their consciousness.
Drugs and entertainment are not simply things to be supported ignorantly or blindly. Many people's choices are being directed by attachments to "Feeling-good" pleasure traps, and also denial of their condition in reality where they seek to escape from some form of suffering. These things don't help them heal in most cases, it only serves as a means or drowning out their suffering momentarily and the problems are never resolved.
Take care. Peace.