Casino games like roulette happen indoors, with players facing the house....

https://stephensexpertword.publishlane.com/posts/is-roulette-gambling-or-betting-understanding-the-uk-definitions-and-context

Casino games like roulette happen indoors, with players facing the house. Gambling covers any risk for money, from slot machines to lotteries. Betting specifically means placing a wager on an event, such as football matches