YouTube comment section can offer more like reddit. Where extended multiple level discussions can happen on the video with user profile and karma and all.

They do have karma! Once upon a time I have insulted some bot account by the most insulting word possible (some foreign analog of f-word) and a lot of interesting thing happened in the same day and still happens during maybe one year. I become shadowbanned on most of my favorite big channels (chat posts in streams are visible to only me). Also most of my comments in comment section under videos become visible only if press "sort by" then "recent", this action is not just sorting comments but it recounts the number of comments and reveals comments of persons like me!

I believe there are positive cases of karma when a person becomes moderator.