As i understand Jumblr airdroped from swaps. The August 18th, 2017, October 15th, 2017 and last will be January 15th, 2018. So you need to hodl your KMD with privkey to receive Jumblr.
Indeed jumblr came from a KMD snapshot and not from BitcoinDark. It was only done once and never will have another snapshot again. Jumblr is use for implementing privacy transactions that also earns dividend from transaction fees collected . The said date above are just for BTCD swapping event . No more jumblr snapshot.