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I do not see what your conclusion has to do with your premise.

Subreddits have topics and rules. Moderators curate posts to suit those topics and rules. This has value.

But you can, evidently, get people to maintain echo chambers for free. You can't necessarily get people to be impartial moderators for free.

They also curate posts in ways that have nothing to do with the topic.

My local stage and municipality have subreddits. The state subreddit was taken over by political hacks years ago. The municipality subreddit is getting worse and worse.

There’s no obligation at all to administer a regional subreddit in an inclusive way.

Plenty of folks are making a lot of money out there maintaining an echo chamber (facebook, many politically-aligned news websites on all sides) on the internet, so while I agree that it's maybe not great for society, it does seem to work pretty well for capitalists.

Fox News makes about $12 billion a year off their highly partisan echo chamber.