Your personal Tumblr library awaits
The way some fic writers on Tumblr commit casual theft (unauthorized use; treating others' creations as free-use because they "found them online") by using fandom art/photos without the creators' permission makes me wonder how they would feel if someone plagiarized their writing.
Even if credited, are they okay with third parties feeding their work into a.i. or posting their fics on other platforms without their consent?