A MOOC Course Suddenly Vanishes

(7/9/2014) Imagine that you take an online courses and start working on it. All of sudden the course site disappears. What is going on and who is responsible for those students? A course offered by a professor from the University of Zurich just disappeared like that on Coursera. Coursera has no control over the course and the strange tweets from the instructor afterwards just make things even weird. Who should be responsible for the course and how to protect the rights of online students?