Agreed - moderation at scale is a tough and expensive problem to get right. That said, I wonder how much these days it would take to get it working well enough

Agreed - moderation at scale is a tough and expensive problem to get right. That said, I wonder how much these days it would take to get it working well enough using existing LLMs. I'm not sure how much you would need to do that wasn't a bit off the shelf if you were mostly trying to keep your safe harbor protections / avoid regulator scorn.