If anything, a 429 is a nice heads up. It could have been worse; she could have redirected those requests to a separate URL with an... unpleasant content, like a certain domain that redirects to I-don't-know-what whenever they detect the Referer header is from HN.
So my question to you is... ...why is it so anti-you, and why should it be different?
> Unconditional requests: at most once per 24 hour period.
> Conditional requests: at most once per 60 minute period.
(Source: calling `curl hxxps://rachelbythebay[.]com/w/atom.xml` twice)
I find this a particularly amusing comment, given that the main complaint is about feed reader's not sending conditional requests.
Learn2cache indeed, feed reader authors.
All feed readers/clients should cache responses when sending multiple requests the same day.