This idea is to prevent spoilers and backsitting.

So they way mods have prevented these things until now was deleting spoilers/backsitting/etc very quickly hoping the streamer won't see it. But sometimes it happens anyways.

So my idea is this: when you activate "Spoiler mode" you can only see the messages that have been aproved as "safe" by the mods. That way, everyone is safe 100% garanteed.