Is Phemex legal in the United States?

Hello, I'm interested in learning more about Phemex and its legality in the United States. Could you please provide me with some clarity on whether Phemex is legally allowed to operate in the U.S. and if there are any restrictions or limitations for U.S. residents using their platform? Additionally, I would appreciate any information on the regulatory framework surrounding cryptocurrency exchanges in the U.S. and how Phemex complies with these regulations, if applicable. Thank you in advance for your assistance.