Ser, if played more properly and seriously, Monopoly is actually a game that requires skill and strategy to win consistently. It's "fun" for spending time with friends/family, and also "relaxing" if no one made a bet with real actual money to award for the winner of the game. But bet enough money in the game, and you'll see the relaxing mood, become more serious with more intention to win. Hahaha.
If monopoly is added for betting then it will be interesting, but if we play for fake money then it will not spur challenge and just normal game. I have searched for the keyword Monolopy betting has been added to several casino sites but some of the games have been combined, so it doesn't look like the usual monopoly game. But the monopoly game might be worth adding to the popular casinos because the game is famous all over the world and the casino just needs to update the game concept to be more interesting and provide some challenges for the players.