Duolingo maybe or maybe not, but even having God himself at your beck and call behind a chat interface will not guarantee you learn a language. Every stage of language acquisition requires multimodal stimulation and long sustained effort that can't be shortcutted by having a smarter teacher.

> Sensei, please teach me the ways to reach alpha just like you

obligatory Bruce Lee - https://m.youtube.com/watch?v=QQiH2-bLOmQ