What is the KCS fee on KuCoin?

Could you please elaborate on the KCS fee imposed by KuCoin? Specifically, I'm curious about the purpose of this fee, how it's calculated, and how it affects traders on the platform. Is it a flat fee or does it vary based on trading volume? Additionally, I'd like to understand if there are any benefits or incentives for traders who hold KCS tokens, such as discounted fees or other perks. This information would be helpful in making informed decisions regarding my trading activities on KuCoin.