KuCoin was famous in 2017 but after Binance appeared, KuCoin is no longer one of the exchanges worth choosing and prioritizing. KuCoin's transaction costs are also quite cheap, but KuCoin's ecosystem cannot compete with Binance Smart Chain.
Unfortunately, KuCoin does not have an ecosystem expansion strategy despite being born very early.
Kucoin is still famous and in my opinion, it is one of the top 4 exchanges (Binance, Bithumb, Houbi and Kucoin) by popularity and trading facilities. I am still a huge fan of kucoin but only Binance has reached top and has created a benchmark for it where other exchanges are only exchanges and their tokens have no utility and own smart chain like Binance chain. So Kucoin is good as exchange but not like Binance for its smart chain which is now a major trend.