I wanted a not-too-intrusive Github notification system that would give me a broad overview of what happened in my starred repos (i.e. repos for which I'm only a consumer), as some kind of ‶real-time″ changelog. Indeed, I star quite a lot of e.g. emacs packages and other small utilities, which don't have a strict release schedule/changelog cycle, so it's easy to miss a new feature.
So I developed a service that would send me a weekly newsletter of ‶what happened″ (issues, releases), and I decided to make it public, as I assumed I was most probably not the only person with such a need. I never planned on making actual money out of it, but I thought it could recoup hosting costs, which it didn't.
But on the other hand, I learned quite a bit while doing it, so it's probably still a net win.