I would not call it a bug. I would call it a severe process or systemic failure. Their SDLC clearly did not include any sort of phased rollout or canary deploym

I would not call it a bug. I would call it a severe process or systemic failure. Their SDLC clearly did not include any sort of phased rollout or canary deployments. Bugs are inevitable, what matters is being able to catch them before you push them to every end user on the planet.