I’d say many “grind” games today, such as Valorant, League of Legends, etc fit that U-shape as described. You get hooked with a fun game in the early weeks, the

I’d say many “grind” games today, such as Valorant, League of Legends, etc fit that U-shape as described. You get hooked with a fun game in the early weeks, then become addicted - while no longer enjoying the game nearly as much - as you futilely attempt to reach the upper echelons, where fame and glory (supposedly) await you.