Co-Author here: A cdn using peer to peer has been on a lot of people's minds for a while. There are certainly going to be lots of competing implementations, but you can already start perusing PeerKit's code on github

https://github.com/PeerKit/peerkit

It wasn't launched. A video about it was launched. (Sorry, but landing page posts to collect email addresses are a pet peeve. That one was posted at least three times.)