
I think you may be talking about UNQUALIFIED wannabe foreign teachers who are not working with real/verifiable university degrees, and/or Serbian and Ukranian refugees pretending to be American native-speakers or someone working at a black market private school without the mandatory Z visa required to teach LEGALLY.
For Legal teachers that are truly qualified the average salary TODAY in 2021 is 31.000 rmb for AP, Art, Subject, TOEFL, IELTS, and TEFL teachers as confirmed by many sources and not just one tefl recruiter who probably wrote the OP to low-ball everyone applying for teaching jobs in China. Here are the facts https://chinacareercenter.wordpress.com ... per-month/
If you want the CTA breakdown by region look at the above photo chart. If you are earning less, you simply did not negotiate a good contract or you are being cheated by some recruiter who low-balled you and is now pocketing the balance of your salary and splitting it with the principal.