[marcinzm]

>their technology _only_ kicks in if the user experience can be improved by using peer-to-peer

I'm curious on how well that works in practice.

I'd imagine there's more failures modes versus a regular CDN even after the initial decision of P2P or CDN. For example, you're downloading from another user who suddenly closes their app or whose network connection degrades. You can handle that but you'll need a larger buffer, on average, which increases latency.