There was a YouTube channel I was following for about 15 years, of an older woman who had pet foxes. Her health started declining and she always had on her channel something like, "I'll leave these videos up forever." She passed away and YouTube deleted all her content.
The problem is 100x worse for any political content. My YouTube bookmarks from just the past few years is a graveyard of information that's not convenient to have around. It's even true for politics-related jokes, songs, and memes. They seem to be selected for deletion more often than not, within a few years.