Because RSS feeds are not a thing that you should want.
Youtube: every day, making everything worse, in every way.
I don't know if anyone but me is using my youtubefeed program, but if you are, and you had Youtube users in your feeds list, you'll need to upgrade, and cope with the horrible fact that it now has a dependency on youtube-api.pl. (You'll need the latest version of that, as well as of youtubedown.)
But using youtube-api.pl at all means that first you have to jump through a bunch of hideous hoops to generate authentication keys and session IDs, pretty much ensuring that it's far too much of a pain in the ass for anyone to actually use it. Are you using it? Let me know.