They do have a restricted country list (similar to Binance) and currently the US is on that list, so if someone from the US tries to login to the exchange they will not be allowed. I am not going to promote or condone any ways to get around that, although I do know there is no KYC required if you are withdrawing <= 2 BTC per day. If you have friends or family that are logged in and trading from a supported jurisdiction, they can do trades on your behalf.
RE: Why users are using Mandala Exchange to trade on Binance with lower fees, no KYC (up to 2 BTC daily), additional trading pairs, and more!