The main issue is that the need is not well-defined and there are competing solutions that aren't as technically elegant, but as robust and as easily deployed. Competing with them on _P2P_ basis only is really hard. The only real technical benefit is lower latency... and even that may not hold true in aggressively shaped consumer networks. It used to be possible to get a bit of an edge from having near-zero hosting costs, but that's been far less relevant for a while now.