The reason to keep them secret is because they are very clearly not rules. There's nothing too specific about it, and so there's going to be a fair bit of actu

The reason to keep them secret is because they are very clearly not rules. There's nothing too specific about it, and so there's going to be a fair bit of actual judgement calls being made. If they publish the rules, then they become actual rules instead of content moderation guidelines and they lose their freedom to interpret those rules based on context.