Why is KuCoin not working in the USA?

Could you please explain why KuCoin, a popular cryptocurrency exchange, is not operational in the United States? Is there a specific regulatory reason behind this decision, or are there other factors at play? How does this affect users in the US who are interested in trading on KuCoin? Are there any alternatives or workarounds for US traders to access KuCoin's services? I'm curious to understand the reasoning behind this decision and how it impacts the cryptocurrency community in the US.