[st3v3r]

Facebook bought it. Parse was highly coupled to AWS at the time. They spent some 3 years trying to get it to run on Facebook's cloud, and apparently failed to do so. Facebook decided to cut their losses, and shut it down.

[csmajorfive]

We did have many technical challenges (as would be expected, really) but that wasn't why it ultimately went away.

[desireco42]

Parse is not that challenging that you can't reimplement it in any platform you choose, especially in 3 yrs.