you need 665 gigabits of idle capacity to... wherever the attacker is coming from. If the attacker can send five gigabits from some town in vermont, and your

you need 665 gigabits of idle capacity to... wherever the attacker is coming from. If the attacker can send five gigabits from some town in vermont, and your provider(s) can't get five gigabits plus normal traffic from that town in Vermont to your scrubbers, then legitimate users within those networks will be denied service, even if users on other networks are just fine. Essentially, it comes down to the fact that getting packets from point a to point b requires a lot of cooperation, and cooperation is difficult. Yes, yes, if you bought me the fiber, I could build you a 665 gigabit network, on the kind of money that a nerd could come up with, (not counting the fiber) but interconnecting that network with other people's networks? yeah, that's gonna cost you. Settlement-free peering is a thing, but it is really difficult to set up and maintain those relationships.