Is Pionex allowed in the US?

Could you please clarify whether Pionex, a cryptocurrency trading platform, is permissible for use in the United States? Are there any legal restrictions or regulations that might hinder its accessibility for American traders? Are there any specific states within the US where Pionex's services are not available or face stricter regulations? Understanding the legality and accessibility of Pionex in the US is crucial for many traders looking to explore its features and offerings.