I imagine the culture of HRLF trainers affects things. Maybe there’s disproportionally more of them from Oz/NZ, as native English-speaking countries with possibly lower wages?

I had heard that a lot of human feedback was being provided by people in Nigeria, as it has a very large English speaking population (owing to its history as a British colony) while also having low wages. This was the explanation given as to why ChatGPT seemed to use the word "delve" so often, apparently it's used much more frequently in business contexts there.

Possible that they're using different sources of feedback for different training though