A tarball of _ancient_ DeCSS code has some value because you can use it to "decss" _all_ content made _before_ a certain date (e.g. most physical DVDs). So it makes sense to preserve the tarball in any method possible.
A tarball of an _ancient_ youtube-dl version is absolutely useless because the youtube HTML will have changed a million times in the meanwhile. You will not be able to use it for anything, neither for old nor for new content. Publishing/preserving youtube-dl tarballs is an absolute waste of effort.
The RIAA here is targeting existing project developers, and possibly also users. Trying to scare them away. Not trying to censorship old tarballs of the code which will quickly become useless.
But it's not a tarball of an ancient version of youtube-dl. It's a tarball of a version of youtube-dl from like two days ago. So then it gets posted to some other host or some distributed thing and development continues over there, only with twice as much support because of all the media coverage.
i.e. replace YT with $YOUR_FAVORITE_VIDEO_HOSTING_WEBSITE in the message above.
Or a misunderstanding of the word "anything". (-:
Whereas it is a reach, ironically, for you to assume that all WWW sites are like YouTube, especially given the discussion of "extractors" that I pointed to, and even are moving targets.
As I said before, this premise, that you have assumed like AshamedCaptain, is highly erroneous. I suspect that neither of you have actually looked to see what WWW sites out of the hundreds that youtube-dl works with actually do have changing HTML, and how many of the "extractors" are still happily working years after they were written. (Sadly, the open issues list on GitHub, which would have helped to determine this, is gone, GitHub being a single point of failure.)
This is just entirely erroneous assumption and hyperbole, that everything is like YouTube, that things will change "a million times", and that magically all of those hundreds of WWW sites will stop working and "you will not be able to use it for anything".
"You will not be able to use it for anything because YouTube and every other video sharing website supported by youtube-dl will have changed a million times.
Acknowledge the point and move on.
The codebase was not the useful thing about this project: it was the constant upkeep and whack-a-mole-ing of the various site changes over the 1000+ supported sites.
This event may spark renewed interest and help, but my money is on "slow death" as support for sites and videos decays.
ala DeCSS http://www.cs.cmu.edu/~dst/DeCSS/Gallery/