There's plenty of gamified learning out there. It's just not something most educators want to use for some reason. Learning has to be boring and dull after all!

Meanwhile, I started learning english (not a native speaker) at age 5 because all the broadcasted cartoons were in english, with subtitles. I remember my dad loading up gamified math puzzle games on the Commodore 64 for me to play. And this was some 32 years ago.

I don't know why it's so underused. Perhaps educator are afraid they'll be seen as lazy or not serious about their teaching if they use such measures?

What I do know is that gamification was one of the best ways of being educated as a kid.