I really don't understand people saying that this is due to AI commits and it is all the volume's fault.

A volume increase that is a single order of magnitude (which 14x is) should not result in this level of failures.

When I compare what Github does and the volumes vs social media companies, payment companies, video platforms, etc, it just doesn't make sense that it is just a volume problem.

It looks a lot more like a platform that already has baseline issues that are compounded by increased volume.