Not only Copilot, seems like some Microsoft services like Bing AI and Bing Image Creator have some issues today as well with 4xx / 5xx, and incorrect region authorization (had to switch the account region from a European country to US to make it work again on mobile)
I think you may have missed the joke - they were implying Github was using Copilot internally, causing the outages, due to poor output. Not that Copilot itself was unavailable (although that may be true, also)
