“Researchers who do not speak native English are using ChatGPT a lot, as an aid to writing and to improve the English language,” says Delgado Vázquez, a researcher from the Pablo de Olavide University, in Seville, Spain.
So in a lot of these cases it's people who don't speak English or don't speak it very well having ChatGPT work over a machine translation of their actual work, and seemingly in other cases it's a knock-on effect of researchers who are still learning English interacting with it a lot and incorporating its idiosyncrasies into their own English.
Even before this ai surge, you'd use auto-translation and then hire a local speaker (well below minimum wage)to edit. The translator was only for the final edit. Saved lots of money. My mum saw her income go from 120k to around 20k over the 2000s and 2010s (Japanese exchange rate didn't help).
I can only assume it gets worse, but she's retiring.