Have a look at the following clip from the British programYes Minister, which Sir Humphrey's former Oxford college explains its dependence on overseas students for funding:

https://www.youtube.com/watch?v=WW7mhtp5a5E

This clip is taken from the episodeDoing the Honours, which was first screened in 1981. This means that the issue of the dependence on overseas students by educational institutions is not a new phenomenon!

For a more recent discussion of this issue, see:

https://www.smh.com.au/politics/federal/scott-morrison-should-act-as-international-students-stay-away-says-anu-chief-20201223-p56ppp.html

https://www.abc.net.au/news/2021-05-22/international-students-exploitation-report-fair-work-ombudsman/100114432

Are Australian educational institutions too dependent on overseas students for funding? Are Australian businesses too dependent on overseas students for cheap labour?