Comment by mat_jack1

In past instances similar to this one, when Heroku wasn't acknowledging or giving any details it was a case of DDoS. It makes sense to stay quiet to avoid other potential attackers to pile in. Maybe they have found an AWS endpoint that was suffering DDoS attacks and they brought down a lot of people with it. Heroku is surely on AWS, I'm positive that also OpenAI is using something there and all the others affected. Let's wait and see, it will take a few days for sure.