Is it illegal for Americans to use KuCoin?

Could you please clarify if it's against the law for citizens of the United States to utilize KuCoin? This question has been lingering in my mind, and I'd greatly appreciate it if you could shed some light on this matter. KuCoin seems to offer a wide range of cryptocurrency services, but I'm not entirely sure if its operations comply with the legal framework in the US. Given your expertise in the field of cryptocurrency and finance, I'm sure you have insights that can help me understand this better. Thank you in advance for your assistance.