It is different in that a completely unrelated third-party can pin this content of their own volition, and it will continue to be provided under the exact same address/hash. In the web, the domain owner is the single entity who can ensure survival of the content.
And then someone will have to put in the money to pin/host the content anyway if you want to keep it online.
Link rot is solvable with tools such as WARC Proxies.