Well, when we say GitHub, we are talking about thousands of services. I don’t think we can pinpoint the overall operational failures to programming language choice. In my experience, these kind of issues are mostly caused by poor organizational architecture + poor project management. In GitHub’s case, I’m also confident to say the choice of infrastructure plays a much bigger role than Ruby.
Oh yeah. If someone says C++ has poor memory safety than Rust then no one is triggered. But say something about Ruby (the language on a secular decline - https://www.dice.com/binaries/content/gallery/dice/insights/...) and the pitchforks are out.