But why wouldn't they want to be pushed and challenged? The only thing universities offer is the chance to learn more and be pushed or challenged. AFAIK they could not possibly be there for any other reason than to learn deeply.

I think it would be interesting to know if professors who push and challenge within a non-dgree open online course would face the similar wrath? I'd bet not.

"The only thing universities offer is the chance to learn more and be pushed or challenged."

Um, have you been to a university? ;-)

When you think about it, the professors aren't (necessarily) there to teach either. They are there primarily for the opportunity to do research though that may be changing as many professors are part time minimum wage contractors.

Yeah, exactly my point. That statement is laughable to anyone who as been to a University. I'm not even sure if being pushed and/or challenged to become better educated is even a primary focus of Universities.