Subscribed. Cool idea. Will it be taken over by robots and people gaming the system for upvotes? Most definitely. But maybe there can be some interesting conversation before that happens.
If it takes off (huge if), it's more likely to be taken over by the fans of a few people with prominence (deserving or not), a few will end up talking about "controversial" topics and people will split between "the nice place shouldn't be about non-nice things" and "what is nice".