You would still have to encrypt that though, which reintroduces the problems of key management and authentication/trust. I'm sure that issue is resolvable thoug

You would still have to encrypt that though, which reintroduces the problems of key management and authentication/trust. I'm sure that issue is resolvable though, although I would expect that most ISPs simply drop that type of traffic completely as it can only hurt their operations. So you'd also need to find ways to route around ISPs that don't choose to participate in this.