(Author here) Maybe possible to figure out a way to use this. The problem is the people using it would still need transport to your network, which in practice can cost as much or nearly as much as direct DIA to their location.

The reverse here is maybe interesting too - a lot of WISPs have a bunch of spare 'upload' (from their perspective) bandwidth available, and by definition it's very geographically distributed, maybe that would be of use to CDNs?

I'd love to chat more about this if you're interested. Email in my profile.