The small goal setting is the happy path of its usage. As you rightfully notice, those actually in need of such app should seek real treatments and gamification

The small goal setting is the happy path of its usage. As you rightfully notice, those actually in need of such app should seek real treatments and gamification could be part of them - if and only if those doctors recommend it. Otherwise I can imagine the app also building (untreated) frustration if some goals are not correct for whatever reason, and also frustration because some would think they get real treatment while they're not. Just guessing as I'm not a psychologist.