We should be able to find something interesting in most codebases, as long as there's some plausible way to build and test the code and the codebase is big enough. (Below ~250 files the results get iffy.) We've just tested it a lot more thoroughly on app backends, because that's what we know best.
Something else, it's a self-hosted Git server similar to GitHub, GitLab, etc. We have multiple repos well clear of 1k files. Almost none of it is JavaScript or TypeScript or anything like that. None of our own code is public.
Imminent AGI/ASI/God-like AI/end of humanity hawks are part of a growing AI cult. The cult leaders are driven by insatiable greed and the gullible cult followers are blinded by hope.
And I say this as a developer who is quite pleased with the progress of coding assistant tools recently.