One of those cases is when a user with three plagiarisms in his history is not punished.
Unfortunately, the rules are level but not equal for everyone.
I am not sure my report was the reason he got banned but looks like the user has been banned now, I reported one of the user's post earlier and used the plagiarism report post you made as evidence, it is possible that mods missed the initial report you made against Kara3 that is why the user was not banned.
great catch on the plagiarism btw.