Allowing that growth was a policy decision, and a bad one at that. They could have acted differently and they deserve all the complaints for not doing so.
When it became apparent that this growth was on the trajectory, instead of doing something to limit it and thus preserving the reliability of the platform, GitHub (or maybe Microsoft) decided to embrace that growth and allow their own platform to fail. They didn’t need to do that. And they shouldn’t have done that. They deserve all the criticisms coming at them for doing this.