We can change which sections each member can access. If someone has had a lot of violations in one section, and they are causing too many problems in there, that section could be hidden from them, which would probably count as a “shadow ban.” It has only been done a few times, and we send a PM to let the person know their access to the section has been removed.
Oh yeah I think I heard some people got banned before from S&C specifically, forgot that. But if it's hidden from them I don't think that counts afaik shadow bans are when you can still post as normal but nobody else can see it. On this forum even ignore lists don't really work and there's no way to block people. But they have stuff like that on reddit.