In the long run you likely have more chance of winning money from sport betting than you do from playing at a casino. Every game in a casino is engineered to eventually move all your money into the casinos pocket by basic mathematical odds. At least with sports betting the casino are reduced to taking an educated guess, based on a lot of number crunching of previous statistics on the outcome of the game with a nice buffer built in for them to secure a profit. If you stay away from multi-bets, which is where casinos make most of their profits, then you stand a fair chance of success if you closely follow sport and are able to distinguish profitable bets due to surrounding factors (weather, a good player being out, etc.)
If they really can analyze and get information before the game takes place and can choose the right team that has a bigger chance of winning than their opponent, they can win money from sports betting. And they should specialize in betting on one type of sport instead of studying many sports because it will take more time to analyze. And once they can get good experience betting on sports, they will move from slot games to sports betting because they think it can really work in their favor.