I don't see how NSFW content can make its place on non-profit fediverse. NSFW is very taxing to moderate, so it makes perfect sense to me that volunteers would refuse to deal with it and outright ban porn (while still being more understanding of non-pornographic nudity than say Instagram, which banned a museum from publishing pictures of nude statues 🤦).
Porn is the lifeblood of a free internet
Your view of the internet must be pretty sad
But OpenAI's models are proprietary. I'm a bit with Stable Diffusion since the models are open, but fuck OpenAI. OpenAI is not in favor of reduced copyrights. They are in favor of not being negatively affected by copyright, but still benefit from it.