Not an expert on networking infrastructure. But I believe this is due to scalability bottlenecks, like Bandwidth. P2P infrastructure is usually run on hardware

Not an expert on networking infrastructure. But I believe this is due to scalability bottlenecks, like Bandwidth. P2P infrastructure is usually run on hardware designed for personal use. I think to see real adoption of P2P technology, one has to make it work better and cheaper than the current existing cloud infrastructure.