If the pinning came with encryption where the key is not known to the pinned system, I think most would be OK with it. There's no way to know, or demonstrate that anyone could know, the contents of any given file. Furthermore, the file could be broken into encrypted chunks and distributed redundantly to many users. Kind of like BT turned inside out.
https://en.wikipedia.org/wiki/Perfect_Dark_(P2P) is this kind of system. You allocate a slice of your disk for the program to use as a global cache, and random encrypted chunks from the network end up downloaded into it.
