I think having publicly-viewable ‘karma’ is a mistake - there’s no benefit to having karma-whore posts and bots if it doesn’t gain you anything, and that’s a cancer that eats away at other platforms. Similarly, the effect of brigading a single comment is much less - encourages conversation rather than groupthink. And we can all see each other’s posting history anyway - we can see whether any given account is a troll account and admins can ban them.