Ill-gotten? Have you been to Target or Wal*Mart lately? China is getting our US dollars fair and square, from the profligate consumerism of American citizens.
On the back of other Chinese who do backbreaking work, corrupt officials skim their savings via financial scams, and relocate their money to U.S. There are many Chinese who earn their money fair and square, and there are privileged communist crooks who steal their money, using their connection, and resorting to myriad of scams.