I just downloaded the entire Classic Chicago Television youtube channel on a whim
a TorrentFreak article got me spooked so I fired up the ol' yt-dlp. Got the entire channel, including comments, description metadata, and thumbnail images.
A significant number of videos were actually unavailable because of an odd YouTube bug where 15+ year old videos were listed as "currently being processed". I may re-run this later (since I ran it in archive file mode) to get the missing videos, as it seems there may be about 300 out of 4911 videos missing.
They still happily exist on YouTube- for now. So no point in re-hosting, they'll get squirreled away into the Giant Hard Drive of Doom.
If something happens to the actual archive project in the near future, I'll likely section them up into 20gb pieces and post them out on a torrent someplace.