How come there's no decentralized anonymous global library? Like some kind of onion routed, p2p file sharing website? Something like tor + ipfs + storj.

The technology is already there, isn't it?

I know plenty of people who would gladly "sudo docker compose up" something that would route some data between peers like in tor and donate a few tens of Go like in storj.

The demand is absolutely there.

Addendum: nexus-stc looks interesting: https://github.com/nexus-stc/stc