The whole point of the Reddit-style was that subreddits could be controlled by moderators and prevented from slipping into the same old tired town square-esque mess that arrives with popularity. I guarantee a mechanism to remove moderators would result in niche communities that get a surge in popularity winding up with the original moderators ousted because all the newcomers don’t understand the community.
If you don’t like how a community is run, you can start your own for completely free. That’s how this works, you shouldn’t be able to commandeer a community from the people who started it. If there’s a truly problematic moderator, the new community will grow quickly.