Are there any restrictions for US users on MEXC? I'm particularly interested in whether or not US citizens are allowed to use the platform for cryptocurrency trading. I understand that regulations can vary greatly depending on the jurisdiction, so I'm curious to know if MEXC has any specific policies in place for US users. Additionally, I'd like to know if there are any potential risks or limitations for US traders using MEXC, and if there are any alternatives that might be better suited for US citizens.