They started off with a business model which entailed having users translate documents for partners. Last I read, they have pivoted to using ads and in app purchases, along with charging for certifications. I don't know whether or not they are turning a profit with these methods.

Is uber actually making money? Is Twitter actually making money?

Facebook, Airbnb, Stripe, PayPal, Hulu etc are making money. I think the point is that if education is a good area for entrepreneurs to make money, there should be some example success stories already. So far, nothing worth mentioning in education segment.

My point was that you can be big (and successful for some definitions of success) without being profitable.

How? Other than non profit / charity, how do you get money to pay expenditures?