Daily trading volume of Bitcoin Z decreased gradually (as you can see through the following chart).
https://coinmarketcap.com/currencies/bitcoinz/I hope that this one is strong signal for next exponential growth in the next few months.
You hope will fail. It's just a signal that the coin is dying. Look at the Zcash roadmap. There is a serious development, and all these useless clones are not needed by anyone. They can not bring anything new.
Now there will start to carry every nonsense, that here 20% of Zcah go to the developers - who already has any difference how the coins are distributed? Let it be better that 20% go to the development, than most of the coins accumulate in the hands of the scammers and wait for all the scams of the action as it was with the Zcl.