This doesn't feel like something I want Steam to do. Valve should not both host the games, profit from sales, and decide winners in the market themselves.
This is really a call for games journalism to step up and try to innovate. Human curators with taste, and a number of them with different mindsets who people can find one that meshes their own, is more important than ever.
I highly doubt without some moderation this will work.
People tend to do things unless explictely deterred or not allowed in the first place.
e.g. There is no u-turn sign (though in the area it is illegal) people will make u-turns regardless, unless cops are watching over them.
Same thing here. People will still post AI slops unless there are some watchers.