I feel like what you're talking about gets really close to the Roth test and I can see how that might be a factor for Apple pulling your app but leaving others.
There's a lot of amateur porn stars on social media that call themselves models. There's a lot of models that aren't.
I don't know how you create an app where people pay money to chat to models with racy instagram photos and discriminate between who's making pornography and who's not.
Our app was quite clean and not taken down due to adult content creators, it was specifically the paid chat functionality they took issue with. And hey, I get it. It was a bit borderline. We took a risk with the business model. But that wasn't my issue it was the 30% fee that really killed us - bending the spirit of the rules to call a humans time chatting somehow a 'digital goods/service' to catch us in their IAP web. This stopped us from being able to pay our creators fairly and caused us to make less than Apple did from our own product after we paid creators. Creators expect more than the 70% so it makes it almost impossible to run this type of product/service on the app store.
There's a lot of amateur porn stars on social media that call themselves models. There's a lot of models that aren't.
I don't know how you create an app where people pay money to chat to models with racy instagram photos and discriminate between who's making pornography and who's not.