If you were not the U.S. contact for the Chinese national's business but only paid for/set-up the website, the only thing you'd be liable for would be the bills from the web developer and/or host (i.e. what you agreed to pay for). But if you are listed as the company's U.S. contact, you are making yourself an agent or representative of the company, at least to the outside world, so anyone who does not get what they pay for, is injured by a product, is defrauded (we know you are confident that will not happen, but it is a possibility), etc. could potentially sue you. So if you take on the role of representing the company, you also may be taking on the liabilty of doing so.