American and European businesses have been lusting over China's population forever. They see incredible growth opportunities but the Chinese have been (wisely) using Western businesses eagerness to copy their business practices or to outright steal their intellectual property.

An American company can't do business in China without a Chinese partner and that partner company is often carefully watching everything the American company is doing so that they can eventually do it themselves. It's a smart tactic that, frankly, African countries should do as well but they don't have the leverage that China has with it's 1.4 billion people. American companies know that they're basically going to be teaching their future competitors but they keep doing it.

On top of that, you also have the cultural and political issues. Our government allows American companies to do business over there partially bc it's believed that economic trade will indirectly lead to the propagation of Western political ideals into China. But what we're increasingly seeing is that the Chinese government is using it's leverage to export THEIR politics.