alt Hacker NewsMost of my YouTube playlists say something like "15 unavailable videos are hidden", or about ~10% for a 5 years old playlist. The same ratio holds true for most bookmarks of YouTube videos I have.
There's videos from ~15 years ago that I consider gone for good - lost to the great copyright apocalypse - having been unable to find them anywhere on the today's internet.
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I've had luck going to my liked videos, hitting the 3 dots under "Liked videos", selecting "Show unavailable videos", and copying the video watch?= ID into google. If the video is popular enough its text should pop up in a forum somewhere with some discussion at least where you'll find the right clues. Example: 9_1Qn370IIY
Same experience. I have years of notes and many link to specific youtube video sources (with time stamp). Unfortunately those URLs don't even give a title of a video, so tracking down removed videos can be hard. However, I've had some luck using LLMs! (obviously only when I can remember the context of a quote or some details about the video, even if vague). Once you know the video title it can often be found on unofficial youtube mirror sites.
YouTube has among the worst linkrot. Stuff gets deleted , hidden, or channels deleted for even the tiniest of supposed violations or reasons.
Same for downloading content. Over 15+ years, there have been so many tools that purport to download YouTube videos and they either don't work or get patched or full of bugs or malware. It's surprisingly hard to do, especially at any scale. more of an art than science. understandably, YouTube does not want people just downloading their content easily without paying for premium.
Any luck with the wayback machine?
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Scrape, my friend.
I saw a similar thing some years back: playlists I had created began to be missing videos.
Been scraping ever since…