I can see that they āgive credits to the authorsā in the first ask you sent, but giving credits means absolutely nothing when they still steal other peopleās 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 Iām sorry but the fact you say āit isnāt plagiarism igā 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 peopleās works, āØchange the charactersā names and then credit the authorsāØ, without the authorsā knowledge or consent, you are still a thief.
saying itās not plagiarism just because credits are given is the equivalent of saying itās fine if someone steals someone elseās car ā because at least they leave a note that says āØthank you⨠to the carās owner before they drive away.