Australian population in 2016 born in China was ~500k. If you assume that the majority of this was happening within that population, if it's 50k "informants", that would mean it's 1 in every 10 people. If you further limited it to students, it would be even more than that.
If this were actually known to be happening at such high frequency, I would expect that Australia would know about it & do something about it.
https://quickstats.censusdata.abs.gov.au/census_services/get...
If you want to experience the US 60's style racism go to Australia. Imagine a place in US named like this https://goo.gl/maps/aoUdGWvFmGcmV7f29
Students doxxed and harassed after protesting https://www.theguardian.com/australia-news/2019/aug/04/we-ca...
The government doesn't do anything about it because Chinese students are a cash cow and every university in Australia as well as the property market would implode without that sweet cash
You toe a line. As in standing where you're told, with your toes on the line.
You tow a trailer. As in dragging it behind you.
https://en.m.wikipedia.org/wiki/Toe_the_line#Misspelling_as_...
Sorry, this is just my personal pet peeve eggcorn. We now return you to your regularly scheduled Hacker News...