3 ms·

GCP was built from scratch as well.

• singron 5y ago
  It's more complicated, but I think everything is at least a substantial layer on top of an internal offering. E.g. GCE runs VMs in Borg using the same physical infrastructure used for other services, but GCE has its own API and virtualized networking on top that hides Borg and was not (at the time) used for any internal services.