I've never heard of these kinds of games, but it would be interesting to see more of these kinds of games on a more mainstream level. For me, I think right now, like any other idea, it's just in a developing and growing phase.

Perhaps in the near future, we'll get MMO or big RPG games that use crypto coins and reward them in some kind of big trading plateform. There's a game called EVE Online where people pump thousands of dollars into ships, just to have them be destroyed in seconds. Once people start making crypto games like that, there'll be a new genre to love/hate.