content: Most sites have this capability it's just the people running it don't know the software offers it. They're called "Hellbans" in legacy software. The major difference is that shadow-banning flags a moderator every time you post to give you approval, so it's like being  under house arrest + constant surveillance. You will never know you've been hell-banned unless you start posting questions and mysteriously receiving no answers, thus confirming you've been yelling into the void. It's normally used on ban evaders so you don't have to play-fight with them for months. Reddit took a simple trolling security precaution and made it...something else entirely. There's also some software that have mid-tiers for argumentative posters, where they can post CONTENT but plain text will not go through. I've seen some of the fancier MMOs that have both available, where people who spam often or antagonise others will be silenced to the outside world, but can still interact with others by trading or jumping into combat, as their offense was not great enough to warrant a full ban.