Let me know what you think, good or bad, and I'll do my best to answer.
What is shadow moderation? It is any action taken against your content that you aren't told about and aren't able to detect while logged in. I focus on Reddit comments since every single removal is shadow removed— removed comments are shown to you as if they're not.
You can try this for yourself on,
https://www.reddit.com/r/CantSayAnything/about/sticky/
Your content will be removed, you won't be told, and it will be shown to you as if it's publicly visible.