Does Upwork (UPWK) rely on riba to operate?

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