What is an Open Source Version of Medium.com?

Dave Winer posted yesterday about wanting an open source version of Medium.com. He created another related post today. I've read both posts multiple times, and I still don't understand what he's wanting. It sounds like he wants a glorified pastebin.

Links:

• http://scripting.com/2017/07/14.html#a033947
• http://scripting.com/2017/07/15.html#a092912
• https://mobile.twitter.com/Dieulot/status/885908162917916673
• https://mobile.twitter.com/gruber/status/885919537627103232
• https://mobile.twitter.com/davewiner/status/885920061919199235

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#todo - excerpt and add thoughts