Since Oct, 2016, milter-manager is powered by packagecloud.io. They kindly provides us open-source plan since ever!
Here is our use-case which explains in forms of interview.
Every new milter-manager release, we don't need to maintain own APT/YUM repository by ourself anymore. As milter-manager is developed for a long time, the repository also contains many packages, it takes disk space a lot. packagecloud.io provides enough disk spaces for keeping milter-manager repository.
And one more thing, we don't need to maintain signing-key by ourself.
We are considered migration to OSDN at that time, but OSDN didn't provide hosting APT/YUM functionality yet.
So, we decided migrating to packagecloud.io.
Before migrating to packagecloud.io, we used sourceforge.net. At that time, we maintained APT/YUM repository on sourceforge.net, but it was not reliable because they changed download URL sometimes without enough announcement in advance. We need to follow-up those changes time to time.
As we mentioned above, we are freed from maintainance of APT/YUM repository, so we can focus on developing milter-manager itself.
Thanks, packagecloud.io for sponsoring milter-manager!