In response to Re Stingy, self-serving GW foreigners in China! (Dark Star)

itp by Callum

Whenever you see such a thing happening, you can report the foreigner either to the tax bureau or to immigration.

Definitely, avoiding tax is a serious offence anywhere on the globe. I bet they haven't asked permission of their first employer to work for another boss. In any event, they'd be refused permission, and they know it! They sign a contract, but break its conditions. They are totally self-centered and that disgusts me.
I've heard of public uni foreign teachers moonlighting at training centers and other private schools in this way. It's more common than one would think. Report the greedy [edited], they only care about themselves!