I don't understand why Facebook never integrated Parse into its own datacenter infrastructure. As far as I can tell, Parse still hosts all of its infrastructure on EC2 (DNS lookups for every Parse service point to an EC2 IP address). Hosting on EC2 made sense when Parse was an independent company, but didn't they sell to Facebook so they could benefit from Facebook infrastructure?

This seems like Facebook throwing in the towel on what seemed like a good plan to gain a foothold in the cloud space.

Either that, or they're not really shutting down, and they just want to get a bunch of free labor from open source developers before migrating to an enterprise support business model.