Not everything is worth archiving for all eternity. Do we really need a 300 hour Final Fantasy 7 playthrough with 3 viewers archived for all eternity like it’s the Magna Carta
But that's missing the point of what archiving content on the Internet tends to be mostly about: you cannot possibly go through all of it and decide what's worth archiving, so you archive it all by default. Then, you can skim through it or remove whatever you choose to.
There is this story about Bill Clinton and Monica Lewinski and how film saved the photo, but this feels like a 1996 problem. In 2006, disk space was cheap enough to save all the photos.