Roblox is not a startup, and has a significant sized footprint (18,000 servers isn't something that's just available, even within clouds. They're not magically

Roblox is not a startup, and has a significant sized footprint (18,000 servers isn't something that's just available, even within clouds. They're not magically scalable places, capacity tends to land just ahead of demand). It's not even remotely a simple case of just "run a script and wee we have redundancy" There are lots of things to consider. 18k servers is also not cheap, at all. They suggest at least some of their clusters are running on 64 cores, some on 128. I'm guessing they probably have a fair spread of cores. Just to give a sense of cost, AWS's calculator estimates 18,0000 32 core instances would set you back $9m per month. That's just the EC2 cost, and assuming a lower core count is used by other components in the platform. 64 core would bump that to $18m. Per month. Doing nothing but sitting waiting ready. That's not considering network bandwidth costs, load balancers etc. etc. When you're talking infrastructure on that scale, you have to contact cloud companies in advance, and work with them around capacity requirements, or you'll find you're barely started on provisioning and you won't find capacity available (you'll want to on that scale anyway because you'll get discounts but it's still going to be very expensive)