This sounded cool until, "Now Goel is forming a business to bring the chatbot to the wider world of education.” // are all educators just trying to create companies these days?
Now, educators who write texts in concert with publishers and then somehow coerse students into buying brand new copies every semester, that's what I'd call profiteering. Not so highly esteemed to me. But, as noted, the profession is a tradeoff a lot of times.
As far as this bot is concerned it seems to do one thing very well: Reducing the costs of offering a teaching method for those who require "human interaction" to learn optimally (spoonfeeding if you want).