They had the NSFW detection dialed up to the point where it would flag a bit of cleavage as inappropriate for real person depictions. They were very on top of this issue and really wanted to avoid any bad press over "deepfakes".

Characters are a bit tricky. For example, Lara Croft could refer to the fictional video game character, or the character in the movie played by Angelina Jolie. They allowed the former, but not the latter. Or a model trained on the concept of "Hermione Granger" from fan art would be allowed, but not a LoRA trained on Emma Watson from the movies. That seemed like a pretty reasonable position to take.