It seems like there is a great need in the world for an anonymous message board (like reddit, HN, etc.) build on a blockchain that prevents it from being shut down. A sort of communications protocol for people to use without fear of moderation or limitation of free speech, other than the downvotes of the other users.
https://cointelegraph.com/news/blockchain-social-platform-st...
Though I didn't try it yet as they closed registration for a while (there was a hack).