My gut instinct is there's both technical and business reasons. From a technical perspective, traditional CDNs are struggling to grasp what it means to be a CD

My gut instinct is there's both technical and business reasons. From a technical perspective, traditional CDNs are struggling to grasp what it means to be a CDN in the peer-to-peer space, their networks have been built to support traditional HTTP traffic, and they've been fairly successful delivering that. Adapting to cacheable peer-to-peer objects would mean large architectural changes. From a business perspective I suspect they also see a challenge where encouraging people to chase peer-to-peer oriented solutions may increase adoption, and start to reduce the amount of traffic they're serving from their private edge as more viewers start to peer between each other.