Is HitBTC legal in the US?

Hello there, I've been hearing a lot about HitBTC as a cryptocurrency exchange platform, but I'm not entirely sure about its legality in the United States. Could you please clarify whether or not HitBTC is legal to use for US residents? I'd also appreciate it if you could elaborate on any potential legal issues or regulations that US users might need to be aware of when using HitBTC. Thank you for your time and expertise!