Before yesterday, on 25 July 2017, the
media9 package was updated by its developer Alexander Grahn (aka AlexG) on the deposit of the CTAN.
Today by performing an automatic update of MiKTeX, this package has not been updated with the latest version 0.82.
Therefore, the MiKTeX client software installed on my computer does not automatically search the CTAN for the latest updated packages (comparing dates). On MiKTeX, it is the developer Christian Schenk who manually maintains an update list to which each client software connects (software installed on computers).
On texlive, the process is also fully manual. Why are client-side package updates not fully automated on latex distributions? Is because of the software that manages the archiving on the CTAN?
What is this software on the CTAN? GIT? SVN? CVS? Another one?