The logic of the GP still applies though. Sites have outages every day so it is inevitable that some large sites will fail around the same time. Also, we know that Cloudflare and Twitter outages were attributed to configuration changes, probably others have benign explanations as well.
Sure, but "configuration changes" does not exclude several of these options. For example, is it harder to predict/deal with the consequences of configuration changes than it used to be?
Well, the options above cover pretty much every possibility, including the one I'm suggesting.
Reddit went down this morning too
Reddit goes down a lot though in my experience.
Reddit being up for 24 hours or generating pages in less than 3 seconds would be noteworthy.
Reddit goes down pretty frequently. It's been that way for years.