Nowadays, government even the one that urges it considering the return of revenue they get from it. There are two types of people in gambling, those who want to win and fill that ego within and those who want to profit because of the latter type of people (these are the casinos or similar entities).
These days gambling is done to get money out of it and very few people think of the entertainment factor associated with gambling.
Gambling casino are built (both physical and online) for the purpose of generating money as houses earn more money than the gamblers. However, gambling is no longer considered entertainment and for those rich people who still think that gambling is entertainment for them, it is an expensive source of entertainment.