On a Hetzner level, you don't quite know, as bandwidth deals between large hosting companies and IP transit providers like Hurricane Electric, Cogent, Zayo, etc

On a Hetzner level, you don't quite know, as bandwidth deals between large hosting companies and IP transit providers like Hurricane Electric, Cogent, Zayo, etc, are typically protected by non-disclosure agreements. Unless you are a big enough fish (FAANG size) in the internet pond to do free peering with all the big boys, the contract with be negotiated for a certain amount of dedicated bandwidth (specified in megabits or gigabits per second), not like the terabyte like in the consumer LTE context.