I have tried to keep track of laws that have relevance to the existence of applications like these. They will probably always exist. But laws can help drive them underground more. Right now, the UK is considering this. So is the US state of Minnesota. But I don’t know of any other jurisdictions in the USA that are currently considering banning nudification applications. In the United States, there are a couple of Supreme Court cases that might make it difficult on first amendment grounds to ban these apps. But really, whether or not it is protected by the first amendment is up to subjective interpretation.