Most GitHub forks are because people don't understand how git refs work. I used to work at a company that required us to fork every repo we depended on and lock our dependency to the fork rather than using a package manager and git refs.
> On 19 August 2009, why's accounts on Twitter and GitHub and his personally maintained websites went offline. Shortly before he disappeared, why the lucky stiff tweeted, "programming is rather thankless. u see your works become replaced by superior ones in a year. unable to run at all in a few more."