GitHub has a service that is meant to be highly available. What are the chances that 1/4th of the engineering effort would be placed in to a local solution? Do

GitHub has a service that is meant to be highly available. What are the chances that 1/4th of the engineering effort would be placed in to a local solution? Downtime is inevitable, and sometimes the thing that fails will cause huge problems and it's almost entirely unavoidable. I'd much rather trust their team, which they've built to design the best service possible, to handle the infrastructure than having to use an internal team to design a competing product (albeit internal) with the same uptime requirements.