Besides how low-effort it is to use AI in any project, I fear the porn and what the psychological and cultural impacts will be in the long run on gen alpha and beyond.
I know that porn, specifically, has pushed forward many different technologies that are now fully mainstream. I don't necessarily have an issue with porn if it's made between consenting adults and the consumer doesn't have an addiction to it. However, things like ComfyUI are making the whole deepfake thing massively accessible to anyone. From training it on pictures scraped off social media all the way to generating full on explicit videos. It's already happened many times, and will only get worse as this goes unfettered, but kids are making porn of other kids. Whether it be out of spite, they think it's a harmless joke, or whatever. I'm sure there are adults making porn of kids, too.
Other people in here have made excellent points, all valid IMO, but this one scares and saddens me the most.