No election campaigns either, they are all dictators-for-life unless reddit head office decides they need to be involved.
This is the same issue IRC has. In the old days, if you were lucky, sometimes you could unseat a tyrant, but modern IRC channel ownership is enforced by the server itself.
This is part of why I like Twitter, even though I haven't been active on it in some time. People have to opt-in to you on Twitter. It's impossible to be a tyrant on Twitter, you cannot compel people to pay attention to you there. The disadvantage of Twitter of course is that it's full of bots so you have to put together your own curated lists of people that seem reasonable. I don't even look at the home feed.