If people only played for fun, I think gambling would still be big, but not as massive and hyped as it is today, and casinos would earn much less. Because if it’s just for fun, players probably wouldn’t come back every day, they’d only play occasionally whenever they felt like it. Playing for fun means not taking gambling seriously compared to addicted gamblers or those aiming to win and make a living from it.
The gambling industry really is all about the money. Wonder why there are so many casinos and different kinds and events to gamble on constantly, because there is always money to be made from someone's greed or someone's depression in the gamble centers.
Where people play for fun would have the natural characteristics of a beach or a natural park where people go to socialize or relax and not with serious infrastructure or bankroll management.
Even the government of almost all countries of the world today, make some certain percentage from taxing the gambling industry, so i wonder why it wouldn't survive for long, from generations and through many generations yet.