The Legal Landscape\n\n However, foreign nationals are free to gamble in the casinos and given that they make up 80% of the 36,000 population, that's most of the country anyway. The history of the gambling ban itself is a large part of why Monaco has the identity it does today.
The citizens of Monaco are forbidden to enter the gaming rooms of the casino. The rule banning all Monegasques from gambling or working at the casino was an initiative of Princess Caroline, the de facto regent of Monaco, who amended the rules on moral grounds.