In the context of knowledge workers, It is really about Claude Cowork against Microsoft Copilot suite for all their applications, which is what the OP is referencing ?

Github Copilot can use Claude APIs and has its own problems and challenges.

Microsoft AI performance is primarily not being affected by Github - while significant is much much smaller part of the enterprise revenue stream and their DAU compared to their Office suite apps.

Same for their PR exposure. It is lot more likely to here about Copilot in the office context than Github outside of small niche's like this forum.