If someone released a chatGPT/characterAI with NSFW content enabled it would eat into a big share of their users (and for characterAI, maybe take all of them). Seriously, look into what people are posting about when it comes to characterAI, and it's 80% "here's how to get around NSFW filters". Unsure why nobody is taking this very very obvious hole in AI tech.
What's with the NSFW need? I'd understand if this is some image generator, but here? Is it some sexting, "romance", or is NSFW about something else altogether?
Porn and AI is... problematic. Do you remember deepfakes? And how people used them first and foremost to swap other people's heads onto porn actors for the purpose of blackmail and harassment? Yeah. They don't want a repeat of that. Society has very specific demands of the people who make porn - i.e. that everyone involved is a consenting adult. AI does not care about age or consent.