Medium has gone through a number of versions over the years, but what has been a steady focus in Medium's life in recent years has been its subscription business.
<a href="https://techcrunch.com/2011/06/28/biz-stone-steps-back-from-twitter-to-relaunch-obvious-with-ev-williams-and-jason-goldman/">Last June</a>, Biz Stone and Evan Williams teamed up with long-tim