Honestly it would probably be easy to force the sub to go dark again via ban by posting direct piracy links.

Reddit will probably undelete the content. Some former reddit users have reported that all the posts they nuked out of existence was restore a couple days later without their consent.

Another good alternative to GoodReads is StoryGraph. I prefer it over BookWyrm because it has a nicer user interface and it has an app. However, I don’t believe it is apart of the Fediverse.