These are incredibly complex and massive systems, they do not fail instantly. The failures happen incrementally until they become insurmountable and the system collapse. Incompetence doesn't show its head immediately, it can take quite a while.

Either way, it's clear the acquisition has not helped github in any meaningful way. GitHub is owned by a multi trillion dollar transnational corporation. They have enough money, resources, and human labor to achieve whatever they want, but this is what they want and this is what they've achieved.