This, and: * Asymmetric network links, slow upload especially on cellular * Traffic package limitations, and both DL and UL are counted * Some ISP are very a

This, and: * Asymmetric network links, slow upload especially on cellular * Traffic package limitations, and both DL and UL are counted * Some ISP are very against p2p, sometimes it's a government policy (China banned "Residential CDNs") * NAT