Btw, what is a non-local RSS reader? I have come across multiple that RSS readers that advertise being “self-hosted” and I’m confused about that since in my mind RSS readers are simply clients that periodically query different servers for an .rss file, so I’m confused about where there is anything to host besides the host of the .rss feed.
I think the joke is that there’s indeed unequivocally just three, and that one of them still says four despite that fact, contradicting the readers expectations who normally for this format expects the middle thing to be something that changes with perspective (eg. 6 vs 9)