I have a dear friend that bookbinds erotic (and/or taboo, fandom material) since it's more likely to get pulled from the web by censors, harrassors, and other parties. (https://twitter.com/ArmoredHeavy/status/1102422965222887424) It's been honestly inspiring to see the sheer amount of wonderful literature that survives on in the hands of indie bookmakers from both your link, my friend and others.