‘Responsible’ gambling is still morally irresponsible. People are walking adverts for their hobbies whether they like it or not, so people who engage with gambling will be indirectly encouraging other people to take up the hobby, many of which will ruin their lives. (Also some fraction of their losses will fund advertising that will similarly attract problem gamblers.) The low stakes recreational gamblers keep the system looking friendly and approachable. This is also almost certainly by design.