They say don't roll your own encryption protocol (if something similar or same already exists and it's maintained), but these guys just can't resist.
Using a secure decentralized messenger to share a download (or upload) location on a Hidden S3 Service or one of those decentralized S3 services can't possibly be worse than this.
To commenter in https://news.ycombinator.com/item?id=40289777: BitMessage doesn't solve anything, it uses broadcast and Bitcoin peer nodes that first get the message know where it came from. And BitMessage is not an illegal content hazard of any kind (what a ridiculous statement!).