If I had to guess it's because Github is sitting on top on infrastructure held up by toothpicks and duct tape
GitHub Will Prioritize Migrating to Azure Over Feature Development - https://news.ycombinator.com/item?id=45517173 - October 2025 (63 comments)
Probably both. But it still throws a thorn into the theory that LLMs are about to replace software engineers any day now.
You'd think they could LLM-code their way out of this situation easily if LLMs were the software engineer replacement they are being marketed as.