I've seen support forum sites that have integrated LLMs to automatically generate answers. I doubt that feeding that back into LLMs will improve quality in the long run.
Well, yes, and somewhat cynically also through eg. OpenAIs effort to pay programmers in low wage locations to create high quality train data related to programming in general (thus paying them to automate themselves out of a job)
Debatable, but true, still, my point holds, it'll be able to autocomplete bettereven without direct hints / dataset from SO, esp taking into account GitHub & github issues