Earlier quoted context omitted.
Why does it need to be "web3" and not "RSS"?
How do you prevent someone from copying your RSS and making it their RSS? Where is the proof that you published it first? How do you show that you have many followers when you publish via RSS? How do you "like" something you read via RSS? How do you comment on it? How do you like and comment in a way that proves your identity? How do you prove to the world that your identity is important - aka that you have lots of f…
How do you prevent someone from minting their own NFT using your NFT's underlying image file? You could rely on a third-party centralized search engine which looks at the actual content to determine which one appeared first, and the same would apply to RSS.