It only takes a couple of times to realize how quickly something you care about can be taken away and you'll never see/hear it again. Netflix brought on such convenience. I remember I watched Scrubs front to back multiple times, until one day I was told that it was leaving and suddenly I couldn't watch it anymore.
Youtubers and creators come and go, if there is something you care about it's on you to preserve it. No one else will.
I wish there was a legal way for me to create a "backup" version for others to watch like a PeerTube instance, but to creators they would see it as not fair to them, so unfortunately my collection remains private.