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That’s not what nefarious means.
adjective: nefarious (typically of an action or activity) wicked or criminal. “the nefarious activities of the organized-crime syndicates”
I never understand people who obsess with words instead of language itself, not trying to disrespect you, but it’s like you are trying to prove a point or go in too deep, when the answer is very simple. It’s all about the context. You can safely say it’s criminal to show a month-old post in “Hot”.
Except that nefarious is not a direct synonym for criminal. Nefarious has a subtext of specific underhanded malicious intent, whereas criminal doesn’t have the same intentional connotations.
If one were to read about a “Criminal website”, it might have instructions on how to make a bomb or something like that, whereas a “nefarious website” is likely to be read as looking normal but stealing your information.
By calling the sorting nefarious, OP has (likely) unintentionally implied that there is an underlying sinister reason for the issues, which is not likely to be the case.
Because words have meanings? If words just mean anything you want them to mean then they mean nothing.