Steam does have Curator Connect, which kind of does that - https://partner.steamgames.com/doc/marketing/curators https://partner.steamgames.com/doc/marketing/cu

Steam does have Curator Connect, which kind of does that - https://partner.steamgames.com/doc/marketing/curators https://partner.steamgames.com/doc/marketing/curators - granted, it comes with a couple of drawbacks, the main one being that the reviewers need to have a Curator group set up