In all seriousness, I’m happy for them to index my public repositories, but no, I don’t want my email program to show me “relevant” ads based on my private repositories or integrate the contents of my private repositories into their profile of mine.
[edit: not to mention company lawyers looking to sue some NDA violating employees]
Perhaps you could grep for common libraries like "ffmpeg" and make a guess as to what sort of software it is. Maybe a video editor/player in the case of ffmpeg. Once you figure that out, you could show advertisements for the same sort of software.