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If your flag weight went down (and you're sure that it was those flags that were dismissed), someone might have seen the 'researchy' aspect of the question and decided not to take action.
I, however support academia. Spammers often see accounts obliterated on site, and this should be reflected in research. All kidding aside, SPAM is SPAM, the accounts weren't even registered and the questions were extremely off topic. Stack Overflow isn't anyone's personal "Google Juice" tool, academic or otherwise.