>...curated content from the userbase.
The key word there is "curated". Just upvotes/downvotes is not sustainable for quality discussion. It just leads to low quality easy effort content like memes. Moderators are important to keep discussion on track and prevent the sub from becoming a cesspool. Of course, they can and do still power trip, so still a problem.
I don’t think there’s really a good solution here... Anyone can go rogue anytime.
Stack Exchange attempts to solve this using three methods: their “reputation” method (gamification), elections, and paid moderators. If you can prove to the community you’d be good, you and a few others are “elected” community moderators (happens once a year?). If you get 10k reputation on a single site, you get access to those moderator tools as well.
And for those with less, you get a smaller set of the tools. For example, IIRC, the “close votes queue” is unlocked at 3k(?). It seems to work well enough.