Why can't i use KuCoin in usa?

I'm curious, why exactly can't I use KuCoin in the USA? Is it due to regulatory restrictions or some other issue? I've heard that KuCoin offers a wide range of cryptocurrencies and trading options, so it's disappointing to hear that it's not available in the United States. Could you elaborate on the reasons behind this decision, and perhaps suggest some alternatives for those of us looking to invest in digital assets?