Some people who are willing to have a change in their lives consider either teaching English overseas or going to exotic countries for various humanitarian jobs.
The Work in China scam comes along with similar opportunities, where the scammers (who might not even be in China) promise to provide you with accommodation, meals, transportation, etc – and, indeed, a good remuneration. The only thing you have to take care of is paying for the visas. The scammers will require you to deposit a few hundred dollars through wire transfer, which should be a red flag.
How to avoid: always do your research and only accept jobs that are advertised and offered through reputable companies, with several reviews. Also, check the visa requirements of the country you are going to.