I have a Kobo Sage and it’s nice, I exclusively sideload epubs/kepubs onto it. I have installed KOreader in case I want to read PDFs.

I recall seeing a web3 project that was meant to gateway from ERC-721 tokens to some kind of durable distributed storage, IPFS or FileCoin or something, in order to solve this extremely obvious problem.

Nobody used it, though, because that’s not the point of NFTs.

Sooner or later I guess linkrot will get them all, though frankly I can’t see how it’s all that much data in the first place.