You can have a searchable index of content without blockchain. The web has searchable content indexes without blockchains for almost my entire lifetime. What does a blockchain actually solve here? Without a blockchain, at a bare minimum, all you would need is for creators to post signed content to an index, and anyone can verify the content with the creator's public key. Whether a piece of published content has a hash that precedes the previous one seems irrelevant.
Immutability. Once a link gets on the blockchain you can depend on it not changing. The content it points to can go away, but with an immutable index, that is discoverable. Censorship and link rot are more evident.
So if someone uploads a 2 hour version of a rickroll and tags it with the name of the latest blockbuster movie and then takes it offline, there is now going to be a permanent record that at some time there was a copy of this movie uploaded? When in fact that never happened?
How is this in any way better, or even something beneficial?
