Chance-based games engage players by creating uncertainty about the outcome....

https://charlottessuperjournals.tearosediner.net/why-do-online-casino-games-focus-so-much-on-visuals-and-interface

Chance-based games engage players by creating uncertainty about the outcome. This uncertainty builds anticipation as players wait to see what happens next. Probability shapes their expectations, making each moment feel fresh and unpredictable