It is not just about Coursera and its videos either. These courses are enrolling tens of thousands of students so there is not even the remotest chance that your comments, insights or questions are ever going to be addressed by someone with verifiable competence such as the University professor or her TAs and RAs.
…these folks just wanted a simple setup for exercising their right to free speech. The total cost for setting up this site? $270 plus hosting. Sure, they could have used blogger, or some other “free hosting” for their blog but this client understood that “free” doesn’t really mean “free” at all, it actually means “trapped.” They decided to choose real liberty and have complete control over their domain, their software, their database and their copyrights.