A message top the Darkspore Forums Index reveals the game will be shutting down for good on March 1st in a note we missed when it was posted in December (thanks One Angry Gamer). It was previously thought this was being closed in 2013 when it was removed from Steam, but it came back online at the time (though it never returned to Steam). Darkspore is an action/RPG spinoff from Maxis based on the creature creator in Spore, and both games required persistent servers, so with EA planning on closing the backend servers for Darkspore, it is now going away, seemingly for good. Here's the announcement:

1st December 2015: Today, we are announcing that we will be closing the doors on Darkspore, effective March 1st, 2016. It’s been a great run and we hope that you have enjoyed your time with Darkspore. While it can be hard to say goodbye, keep in mind there are tons of awesome games available for free on Origin. Enjoy 48-hours of fun with Game Time titles such as The Sims 4 and Plants vs. Zombies Garden Warfare or download the latest Origin On the House release and add it to your library.