I remember my Chinese english teachers in middle school (in early/mid 2000's) complained to us students how they had to regularly stay up until midnight to grade assignments/exams and prepare teaching materials, while foreign teachers get paid double the salary to only teach < 10 hours a week. Older foreign teachers made more of an effort at actually teaching us how to converse like native speakers, while some younger ones were just young adults on gap years and did nothing but teach us how to play hangman/bingo. Chinese schools would hire any native English speaker with a pulse and schools in less-metropolitan cities still do this today.