When Zcash launched, some people were unhappy with the founders rewards so they forked it to create Zclassic which didn’t have founders rewards.
On 1st January 2018, they have announced that soon, Bitcoin and Zclassic are hard forking to create BitcoinPrivate - so Bitcoin with zk-snarks… More details where:
Personally, I’m not sure if this will flop, or will do really well. Any thoughts?