If they can automate flagging/removing content, they can automate providing relevant information to the posters of said content. I'm not suggesting they throw people at the problem and provide on-call personal support to everyone.

The only scaling issue my amateur brain can fathom is the manner in which the information is provided (data in a database then shown in a user interface, email notification, etc). And it's Google -- experts in AI, ML, data, and automation. Scaling sounds like an excuse, not a reason.