After Bnb a lot exchanges tryed to build their own token, following Bnb model, but the most of this coins hasnt been able to achieve greatear sucess as they Sold their tokens to allow costumers to have beneficts, wich in general is only to pay less fees.
Unless you moove around 100k montly you wont see big advantages holding this tokens, as there isnt anything else to do with them.
I had a time i wanted to get KCS to hold because BNB sucess, but volumes are far away and the products built on that time was different.
Im not familiar anymore about what Kucoin is doing and using their own token for, but unless they bring a new chain wich use KCS and some kind of Mining new coins with their token, its a good coin but wouldnt expect too much from it.