We don't necessarily know what's "important" in advance.
Archiving this content can be a nice public service for people who put content on the internet, don't do a good enough job preserving it themselves, and then want to access it later. I've heard "check the wayback machine" as a solution on HN for people whose blog got taken down unexpectedly from some provider and they didn't have a back up solution.
Perhaps the same as the first reason, but some of this content can turn out to be useful as evidence. It's not uncommon for public figures to take down unflattering messages they posted on social media platforms and then deny having ever made them.
We don't necessarily know what's "important" in advance.
Archiving this content can be a nice public service for people who put content on the internet, don't do a good enough job preserving it themselves, and then want to access it later. I've heard "check the wayback machine" as a solution on HN for people whose blog got taken down unexpectedly from some provider and they didn't have a back up solution.
Perhaps the same as the first reason, but some of this content can turn out to be useful as evidence. It's not uncommon for public figures to take down unflattering messages they posted on social media platforms and then deny having ever made them.