Ragnor:kinnadian: I was under the impression that this content server would operate similarly to the Snap Youtube Cache, whereby files are not placed onto the server until someone had downloaded it, and then all other viewers would watch the version from the Cache.
I don't think Steam content mirrors are as sophisticated as google/youtube caches. Content is either on the Steam content mirror or it isn't.
I believe you're right. Snap have absolutely no say on what goes on the cache. Valve has full control over the sever.