I would not have guessed Roblox was on-prem with such little redundancy. Later in the post, they address the obvious “why not public cloud question”? They argue that running their own hardware gives them advantages to cost and performance. But those seem irrelevant if usage and revenue go to zero when you can’t keep a service up. It will be interesting to see how well this architecural decision ages if they keep scaling to their ambitions. I wonder about their ability to recruit the level of talent required to run a service at this scale.