IANAL, but regardless, according to RIAA, youtube-dl is circumventing the "DRM" built into YouTube, and therefore they're violating anti-circumvention parts of the DMCA. Therefore a DMCA claim can suffice to take it down.
Perhaps if youtube-dl used different examples (i.e. videos not protected by anti-circumvention) perhaps they could have avoided this.
Perhaps if youtube-dl used different examples (i.e. videos not protected by anti-circumvention) perhaps they could have avoided this.