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derekzhouzhen
So it is just alternate link meta then a bunch of heuristics for well known websites? IMHO, everyone should just do the alternate link meta and save everyone else the trouble. Once you made a special rule for someone big, you are just encourage them continue to be sloppy.
thirdplace_
You are mostly right. There is some additional value provided:

With known feed urls e.g. https://www.meetup.com/%s/events/rss/ we can save the network call to meetup.com and produce the feed url immediately. This is also an argument for making a browser addon or at least some client code that can produce it.

Discovered feed urls are cached which saves the direct network call to a possibly slow site.

The service produces third-party feeds for websites that don't have it e.g. https://twitter.com/elonmusk => https://nitter.net/elonmusk/rss