Update: Starting on July 10th, 2018 KuCoin will use 50% of all trading fees earned by KuCoin to buy KCS from the market and then redistribute the KCS back to users as the new KuCoin Bonus Program, replacing the old one.

Furthermore, all KuCoin Bonus moving forward will be given to users in KCS, not dust of other cryptocurrencies traded on the exchange, as voted on by users who completed KuCoin's survey some weeks before.
Read the full news here:
https://news.kucoin.com/en/kucoin-bonus-upgrade/