I’ve been a sr project manager long enough to have smelled this a looooooong time ago.
No one can question the ambition and creativity of this dev team but this is obviously what happens when you let creative people roam free without any direction.
It's easy to see where it went off the rails, though. Right around September 2013 (and again in June the following year). It's the point where they left it up to the irresponsible gamer community to determine if they should continue inventing wild and impossible new "stretch goals" (read: scope creep) in return for their backers continuing to shower them with cash. The point where an idealist game designer lost control of his dream project.
Edit: Found a pretty good summary. The two official CIG community polls related to scope increases (from 2013 2014) : starcitizen_refunds