Receiving crumbs of info as to WHY a service is down is interesting to some. These are also great for tracking postmortems (unless they take awhile, then it's a separate post).
Speculation is entertaining to many as well. Or perhaps this sparks an idea for someone (omg, GH is down ALL THE TIME, time to build a novel competitor!).
And given the crap state status pages are in these days (stop showing green when your site is down!), these are great for knowing when a service is operating again.
I thought this was obvious, but apparently it isn't - not 100% of things posted on this forum (or any forum, or the vast majority of human interactions) are driven purely by some abstract "intellectual curiosity" concept.
Probably something about centralization and relying on a company for keeping your business running. But, of course GitHub Enterprise Server deployments aren't down, so anyone that really needs uptime can pay for the privilege (or can pay for GH One which has a "30-minute SLA").