This just sounds like Reddit without solving any of the big problems of reddit.
I know you said you don't believe in federation, but why not solve the problems with federation.. or if you think that's entirely the wrong approach, then figure out some other way of solving the issues that federation attempts to address. Those issues don't disappear just because it's your project.
Wikipedia, although a non-profit, is not federated; it's a centralized platform. It doesn't seem to me that it's centralization that's necessarily the problem, although, I agree with you, it often is.
So are you planning to register Discuit as a non-profit, and turn over control to a board of trustees with half of the members elected by the community?
I know you said you don't believe in federation, but why not solve the problems with federation.. or if you think that's entirely the wrong approach, then figure out some other way of solving the issues that federation attempts to address. Those issues don't disappear just because it's your project.