I cancelled my subscription to a MOOC because the capstone was to write a student-graded essay describing Kerberos.
I'm not interested in describing the details of a single, specific protocol, and student grading in MOOCs is just not very good.
Most people will just rubberstamp you and not provide any useful feedback, but sometimes you get a real jerk who'll fail you without even looking at your work.
I know Kerberos is very important, but the essay project could have been part of the homework for a class, not the capstone for the whole course