In all honesty they're typically just banking on people not noticing it and are trying to make it as little of a fuss as possible and get it up before it gets to twitter. The problem is when it's not just a small blip and they haven't addressed it and it goes mainstream and is still down, it just leads to concerns about transparency.
Building infra I have to work around all sorts of 3rd party services going out or having blips throughout the day, docker registries, caches, bgp, etc., it's totally an expected part of infra design but not every team has the time or need to build in the resiliency. I see tons of outages that never get reported or IMO aren't reported adequately enough.
With that said, I'm no angel, I get all my service down notifications through slack, so when slacks down..