Generalisation defeats everything and everyone. If a budding FT were to trust generalisation, it's most likely that that FT wouldn't have gone abroad to start with.
And you are obviously a 'generaliser', as can be seen from your previous posts.
The important point you've missed is that you, as a self-proclaimed and acknowledged star teacher at your uni in Wuhan, wouldn't have gone there to begin with, or indeed to China for that matter, if you'd have trusted generalisations posted by OP's.
So, stop categorising Chinese cities and recruiters in terms of good or bad in China. Because you haven't worked at those specific workplaces or for those particular recruiters, respec, you've no right to appoint yourself as their judge, as simple as that!
Readers needn't trust secondhand info collated by you. By assuming that responsibility, you're effectively elevating your status on this board, without justification in the eyes of many readers!
You've no right to denigrate the recruiter 'Yuncheng IELTS' and the like based on secondhand information, most of which is untrustworthy in any case, by virtue of its very nature.