That's well and good for the _current_ ability to potentially find some old media, but regarding GP's point about digital data being fickle over long time-spans, Archive.org is only one hack/fire/solar-flare/DDOS/etc. away from being gone (potentially forever). They were recently hacked, thankfully the group who claimed responsibility weren't trying to destroy data.
> A single copy of the Internet Archive library collection occupies 145+ Petabytes of server space -- and we store at least 2 copies of everything).
Thankfully they have a few backups around the world, but there are still plenty of plausible events which could render the data useless. In contrast, physical mediums like books, vinyl records or microfilm/microfiche can last for hundreds of years.
From: https://archive.org/about
> A single copy of the Internet Archive library collection occupies 145+ Petabytes of server space -- and we store at least 2 copies of everything).
Thankfully they have a few backups around the world, but there are still plenty of plausible events which could render the data useless. In contrast, physical mediums like books, vinyl records or microfilm/microfiche can last for hundreds of years.