Is Nexo legal in the US?

Could you please clarify for me the legality of Nexo in the United States? I've been hearing a lot about it as a potential investment option, but I'm not entirely sure if it's legal to use in my country. Could you explain the regulatory status of Nexo in the US? Are there any specific licenses or permissions required for its operation? Also, are there any potential risks or limitations that I should be aware of when considering Nexo as an investment? Thank you for your assistance in clarifying this matter.