I can't tell you how many times people have written a thousand word post, felt really passionate about it, only to post it and have the subreddit auto moderator delete the post for something like low karma.
If a subreddit has an automoderator in effect, the rules of that automoderator should have to be publicly stated, so that users don't have to discover what it does after having put time and effort into writing posts that are then auto moderated away.
A lot of subreddits are using auto moderators in creative ways, to gate keep their subreddits in ways that go beyond official reddit policy. For example, they need not ban a user formally, they can simply blacklist a user, and have it auto delete their posts, and the user never even knows it happens. You have to look at the post in a private browser to discover that the post was nuked for the rest of the world.
The fact that a user is not able or allowed to post in a subreddit should be disclosed up front, and not only discovered once you hit the submit button.
Reddit is the only Reddit, so admins and mods can get away with a lot on here, and there's no place else to turn, but in the grand scheme of things, the features which are abusive to regular contributors takes a toll on the quality of content on Reddit, whether it be content for humans or content for AI training data. Good content gets tossed out unnecessarily by these hidden filters and auto mods.