It's notable that they blame "our upstream provider" when it's quite literally the same company. I can't imagine GitHub engineers are very happy about the forced migration to Azure.
I would imagine the majority of Github engineers there currently joined post MS acquisition.
something about antifreeze in the dogfood
Having worked there around 2020-2021 there were many folks not happy with being forced to use azure and being forced to build GitHub actions based on azure devops. Lots of AWS usage still existed at that time but these days u bet it’s mostly gone.