5: While there may not be that much use for memorising and recognising powers of 2, it's still something that, oddly enough, a lot of CS students seem to struggle with. 2048 could be perfect for that purpose.
Now if there was only a game, similarly simple and addictive, that implicitly taught how logic gates work, maybe we wouldn't be so far from having everyone have a basic idea of how computers work... I believe that the best type of learning is implicit, so there's certainly a lot of potential here. Your observation also shows this characteristic that some people just hate being explicitly taught and can't seem to learn that way, but get them to do something they enjoy and is also designed to teach, and they learn surprisingly quickly without realising it.
Now if there was only a game, similarly simple and addictive, that implicitly taught how logic gates work, maybe we wouldn't be so far from having everyone have a basic idea of how computers work... I believe that the best type of learning is implicit, so there's certainly a lot of potential here. Your observation also shows this characteristic that some people just hate being explicitly taught and can't seem to learn that way, but get them to do something they enjoy and is also designed to teach, and they learn surprisingly quickly without realising it.