There is quite a bit of software whose upstream authors decide that, as they are already using Git for development, the main distribution channel should be GitHub - This allows, yes, for quite a bit of flexibility, which many authors have taken advantage of.
So, I just registered and set up http://githubredir.debian.net/ to make it easier for packagers to take advantage of it.
Thanks to some unexplained comments on some oldish entries on my blog, I found -with a couple of days of delay- Rubigem is from Mars, Apt-get is from Venus, in Pelle's weblog. And no, I have not yet read the huge amount of comments generated from it... Still, I replied with the following text - And I am leaving this blog post in place to remind me to further extend my opinions later on.