A game can offer an experience that leaves the player feeling satisfied or at least content with how they spent their time. There is a large space of possible interactive experiences that extend far beyond the simple dichotomy of fun vs educational or productive.

A game can certainly be considered predatory if it exploits psychological vulnerabilities to hook someone on engaging gameplay that gives the player very little in return in terms of fulfillment or mental recovery. Whether or not it takes the opportunity to swindle the player on top of that is a matter of degree in severity. Wasting a player's time (or worse, induce stress or other harmful mental states for no good reason) is not a particularly nice thing to do.