It is a fine project to limit 'doomscrolling', but I think the premise is wrong.

- I have created my own RSS readers, that contains 500+ sources. I do not doom scroll

- doom scrolling appears when social media algorithm feeds you data, even from a month ago

- I have various filters so I can browse whatever I want

So RSS should just have filters, categories, search extensive capabilities to solve doom scrolling, and on the other hand it will be able to provide you extensive amounts of data.