I don’t see why we need blockchain for this project at all.

There's only a couple reasons why you'd ever "need" a blockchain, the oldest is trustless artificial scarcity. That's why.

Otherwise it's literally just a text file

Serious: is this a joke?

It's not a joke, the prices are insane in large part because this meshes very well with the idea of compsability & permissionlessness that the Ethereum community is very excited about right now.