T.L.D.R. Not every repo on github will want to be included in this list, it would be good to post issues on their repos, send messages or emails to players requesting permission to add their repo to this list or encouraging them to add themselves.
Just because a players Bot code is openly available on Github, does not necessarily mean that they want their code browsed or shared publicly by other players. Some players may be new to Github and are not aware that their code is essentially public, or some may be using open repos on Github because they had to because that is what worked best for their team.
While every player should be proud of how much they managed to accomplish with their time, and should be encouraged to open their code freely for other players to learn from, some players simply wont share those open-source values and/or will want to keep their secret sauce hidden from the world.