This sounds like a great idea... however I would have concerns about security. I've recently signed up for a monthly account with pCloud, to store my videos and photos. I'm very green when it comes to these kinds of things, but if users' personal disk space was used as cloud storage, would that make my private info more vulnerable to hackers? That would be my main concern. That worry aside, using crypto to allow people to rent and exchange computer storage space sounds - in theory - like a great idea.