I eventually settled on using edX exclusively[1], which I don't anticipate changing except for specific advanced courses on the other platforms. My intuition i

I eventually settled on using edX exclusively[1], which I don't anticipate changing except for specific advanced courses on the other platforms. My intuition is that the venture-backed model of the other platforms will make it extremely difficult to maintain a long-term vision of free, ubiquitous education. I did find one edX course which decayed, simply because it required student journaling and deeply personal discussion, which would have been inappropriate to open to the public. 1. Not as exclusively as I thought - I just saw a great course from Coursera and signed up. To date I've only completed edX courses though.