Tor hidden servers can push around 40mb/s with a tiny bit of tweaking. They were working on support for the concept of sharding, but you could do that yourself

Tor hidden servers can push around 40mb/s with a tiny bit of tweaking. They were working on support for the concept of sharding, but you could do that yourself by having multiple tor nodes. Actually, it's been a while since I toyed around with it. By now it's probably faster.