[exasperaited]

Yeah. Down Detector is more or less meaningless unless something massive has happened, and as you say it has terrible consequences for knock-on services.

It's not even just intermediate networks, it's sometimes direct coinnections. For example, a flood of people reporting an outage on mobile phone network X when the problem they are experiencing is not being able to call a loved one who is on phone network Y, which is the one that is down. This happened a little while back in the UK, leading the other phone providers to have to deny there was some broad outage (which is not an easy thing to reassure when there are so many MVNOs sharing network Y)