DUOL Halal?

Is Duolingo Stock Halal?

Is Duolingo (DUOL) Halal to invest in?
To answer this question, we consider:
1. How much of Duolingo (DUOL)’s revenue comes from haram?
2. Does Duolingo (DUOL) rely on riba to operate?
3. What is Duolingo (DUOL)’s ESG impact?