Can the USA use Phemex?

Can the United States of America utilize the services of Phemex, a cryptocurrency exchange platform? It's crucial to understand the regulatory landscape surrounding cryptocurrency trading in the US, as well as the policies and restrictions imposed by Phemex itself. Are US citizens and residents allowed to sign up and trade on Phemex? If so, what are the specific requirements and limitations they need to be aware of? Additionally, how does Phemex ensure compliance with US regulations and protect its users from potential risks?