Except this "type of moderation" is harmful, not beneficial. When someone gets shadow banned, they go back and make a new account, and continue behaving exactly as before. If you want to improve behavior, you need to tell people what they did wrong so they can change. Shadow bans are only useful for people who are deliberately being disruptive, not for people who worded something in a way mods disliked, or posted an opinion mods didn't like.