I used to work at Linden Lab. Its founder, Philip Rosedale, wants to use blockchain to track virtual assets across different virtual worlds. With free content this doesn't matter so much; you can just point at some inventory server and have access to the same stuff everywhere. But the blockchain seems well-suited to tracking something like license keys for commercial content. This is not an application I care about, but I *do* care about decentralized virtual worlds.
http://nwn.blogs.com/nwn/2018/03/vrba-high-fidelity-janusvr-metaverse.html