I’ve been interested in these kinds of tools for a while, that actually act as a bicycle for the mind. Most apps forgo the metacognitive and emotional labor that actually helps people learn effectively in favor of gamification because 1. Modeling these skills is hard 2. The first step to building effective learning habits is to restore the so-called “learn drive” which is the love of learning, play, and tinkering that underlies most effective learning and gamification does so but on an artificial level.
There is so much content out there, and a sufficiently motivated person will find it and make meaning out of it. Most people are not motivated and don’t know how to motivate, meander, explore without gritting teeth, and I think you’ll probably just see churn without gamification unless you deal with that side of the process.
Since I've tried to ship such tools before and ultimately failed, I’m explicitly not doing the whole SV fail fast and iterate thing here: I’m meandering, taking my time, letting motivation move me when it strikes versus going for the easiest or most obvious thing.
(also sorry if this is itself meandering: I’m lifting while typing this on my phone)