I think it's pretty clearly explained in DigitalOcean's docs. They have a public interface and a private interface. The private interface is not Internet rout

I think it's pretty clearly explained in DigitalOcean's docs. They have a public interface and a private interface. The private interface is not Internet routable but is routable by all other instances in the datacenter. I agree that it is a non-starter for me, but it's definitely public.