I would also disagree in general that these require no commitment. I've done a handful of MOOCs, mostly for fun, but I stopped on most of them because I realize

I would also disagree in general that these require no commitment. I've done a handful of MOOCs, mostly for fun, but I stopped on most of them because I realized they were really time-consuming. In particular exercises with deadlines instead of considering that most people doing these classes work full-time and might therefore prefer to complete at a slower pace. On the other hand, apart from niche areas indeed nobody seems to care about certifications.