I wish there was some documentation on what kinds of things are determined unsafe. There are plenty of things I think we would all agree are unsafe. I'm sure we don't want fine tuned models on how to cause physical harm on other people.
I don't envy the challenge of making the call for more gray area, sometimes even cultural differences, in what is safe or not. Seems like a very hard problem we've seen social media struggle with. I'm reminded of some of the Covid "misinformation" being deemed as unsafe