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$0.50 says that the “reveal” was part of the study protocol. I.e. “how people react to being knowingly vs. unknowingly manipulated”.
Seems dangerous, it’s a breach of the ToS I assume so they’re opening up to possible liability if Reddit got pissy. I’m actually surprised this kind of research gets IRB and other approval given you’re violating ToS unless given a variance from it (I used to conduct research on social networks and had to get preapproved accounts for the purpose, and the data I was given was carefully limited.)