the initial idea is similar to RSSHub to parse the site into feed, but not hosted on the cloud, but distributed, running on each client, and different clients can also send feed to each other.

RSS seems to have been abandoned, while atom seems to be on the rise, but both are based on xml. Would it be better if I were to do something groundbreaking and design a set of feed standards from scratch with simple and easy-to-use json? But json may no longer be compatible with the existing feed ecology.