Why the sudden flood of Map Crunch on Tumblr?
Apparently whoever this person is managed to find out about or was reminded of the game and decided to post it to Tumblr. Got reblogged a couple of times by their followers probably and from there it spread like wildfire. To my knowledge, the game was pretty much dead in the interim between this sudden resurgence on Tumblr and when people on /v/ started to lose interest about a year ago. The Internet works in strange ways, but almost always follows the content cycle.