I don't think it's the IP that set it off, it's probably "accesses to the page with this cookie in the link". That is, everyone on HN accessing it contributed r

I don't think it's the IP that set it off, it's probably "accesses to the page with this cookie in the link". That is, everyone on HN accessing it contributed regardless of their IP. And, to confirm this, I also got this email (because the product looked interesting a few months ago) and I can still use the link in my email but the one on the HN post doesn't work. Don't really get why the mods haven't changed the link to the twitter URL yet?