I've been asked a few times why the PR challenge only supports github, and not other repo sites. There are two main reasons: (1) it's by far the most popular, and (2) I have various scripts which use the GitHub API, and I'm too lazy to look into dealing with the other sites. Here are the stats to back up the first point.
The top ten sites, and the number of CPAN repositories hosted there are:
1) 9585 github.com 2) 151 bitbucket.org 3) 138 svn.ali.as 4) 62 git.shadowcat.co.uk 5) 47 dev.catalyst.perl.org 6) 44 svn.perlide.org 7) 28 git.profvince.com 8) 24 git.urth.org 9) 15 git.ieval.ro 10) 14 svn.scratchcomputing.com
So 92% of the dists that have a repo are on github, and second place is 1.4%. The script that generated the stats is on github.comments powered by Disqus