I can see that they “give credits to the authors” in the first ask you sent, but giving credits means absolutely nothing when they still steal other people’s fics.
so it is still blatant plagiarism and stealing, with or without the credits.
credits mean nothing when consent is not explicitly given. the authors being offline for years is not an excuse. if you create something, that thing is permanently yours. an author does not have to stay online forever in order to retain ownership of their own works.
so I’m sorry but the fact you say “it isn’t plagiarism ig” just because the person gives credit is wild to me. yes, it is. credits are only after you got a clear permission from the author and you credit them to both acknowledge and thank them for their consent. if you just copy and paste other people’s works, ✨change the characters’ names and then credit the authors✨, without the authors’ knowledge or consent, you are still a thief.
saying it’s not plagiarism just because credits are given is the equivalent of saying it’s fine if someone steals someone else’s car — because at least they leave a note that says ✨thank you✨ to the car’s owner before they drive away.