I agree totally, that was my point but perhaps it wasn't clear. I can't stand Duolingo or any flashy education tech, as soon as there's a sound effect and bubbly animations I'm out. I learned nothing from Duolingo (I ended up learning the language through other means) but I've learned a ton in my (coincidental) 6 months of Math Academy. MA's Justin Skycak put it best:

https://www.justinmath.com/why-is-the-edtech-industry-so-dam...