As far as I know, project 2025 has a ban on p*rn which does include a good amount of content of fanfiction sites, especially Ao3. I don't know if it counts for written media though. If anything fanfiction is protected by the first amendment and *if* they do try to ban it I believe one of 2 things could happen. 1. The companies would fight legally under the protection of the first amendment (freedom of speech), 2. They could ban certain media