Dodging
The so called "investment in China" in reality is tax and employment law dodging.
Why set up a factory in your own country and deal with high tax and complex employment laws if you can get Chinese to build a factory for you and if workers get upset ship them and their families to labour camps?
Big corporations actually lobby for more complex laws, so that a competition has no chance to emerge, not that they care about domestic workers etc. and to set up a shop in China you need to have a substantial budget, usually out of reach of small business (that could become big).