It always depends on how you use the AI and how much personal energy you put into looking after and controlling it.

First of all, this project does not use any AI technology (it's basically just checking to see what the community's parameters either for pinning or posting are, and if the post fits them). Just clarifying that. Second of all, either way you will need to put energy into controlling something. If you are putting energy into controlling the bot, the bot will be saving you energy from having to filter the baseline violations in your community that are easy to automate.

Certain automatisms are okay and useful for me. But not for the evaluation of content via votes.

The first thing I would point out in response to this: as @remlaps already addressed, this service would not be about voting. It's not a curation trail, and will not have much directly to do with curation. It may be indirectly related to curation because it may allow for curators to see posts that fit certain criteria that the community owner sets up which is appealing for the curator, but this project is not directly looking to curate.

At it's core, the pinning part of this project is about incentivizing post promotion and burning rewards. Both of these things are ways to improve the price of steem/sbd by decreasing the amount of currency that is being added to the market. Both of these things reflect value. Burning SBD for a post means you think that post will make more than the money you are burning. Burning a portion of the rewards shows that you value reducing the amount of steem being produced (and therefore improving the price of steem) more than you value the amount of steem you are burning.

I even think it's a bit "dangerous" to bring this automatism into connection with "promoted". To end up in this category, a contribution should be really good (after all, it should also be advertising for the Steem and set itself apart from all the "plagiarism and boring diaries").

To end up in the promoted category, one must promote a post. That is done at the blockchain level. So this product is completely unrelated to whether or not posts get promoted. What this product does is cycle through the posts that have been promoted to give them visibility. Like I said, my father and I thought this is useful because to promote a post, one effectively has to burn SBD. Similarly, burning a post means to burn the steem that post would have earned in rewards. Both of these things will improve the price of Steem.

Keep in mind that this and the other features in regards to pinning/muting are optional, and that one could solely use the pin part of the project or the mute part. They are a way of setting a baseline standard for a community either for pinning or simply posting in a community. If I as a community owner want the community to only have posts that are longer, I can set that up. And if I as an owner want shorter posts (like in the case of the steem links community), I can set that up. But the parameters would be up to the owner and subject to change at any time. Like my father said, mod-bot has commands so the community owner can make changes quickly if something goes wrong.

Overall, I think this product could really enhance Steem. For one thing, community owners won't have to do as much work to shape the community to be the way they want it to be. That's what automation means. Of course you are right that there wouldn't be as much freedom in judging content because the owner is not judging every article directly, but abstraction is a part of the world we live in, and a necessary one. Imagine if you chose to read Steem posts at the blockchain level instead of on an interface because there is more information conveyed at the blockchain level. Yes, by putting it on an interface, some information is inevitably filtered out by that interface, but the information displayed is much more pretty and readable and presented in a way that enhances the experience.

There's perks to doing things yourself as the owner, but it's also a lot more work. And sometimes you are inevitably doing something that's easily automated, and therefore wasting your own time for the freedom to judge post's individually on a case by case basis. If that is what you are looking to do, then this product may not be useful, but if you find yourself muting the same kinds of posts, or want to ensure the same standard for all the posts in your community, this product might be useful.