As always I hear myself talking. I also thought of black mirror when blocktrades mentioned the reputation system.
Algorithms can be gamed and will force certain behaviors from people. It will turn you into a hypocrite to improve your reputation, it's easy to lie and get to the top in a popularity contest, we have thousands of years of history proving that with politics.
As long as reputation scoring is just an option, I'm fine with it. Communities should be able to run without using it if they wish. I can't see myself starting a community then having a system scoring everyone's reputation.
And I certainly hope it doesn't get embedded into hivemind.