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As long as you get new data in a way that can falsify your hypothesis that's fine. If you bias your data collection to favor your hypothesis that's still cheating.

Inarguably. The folks arguing that it's p-hacking aren't taking the next step of treating the correlation as a hypothesis, testing it, and establishing causality.

Yeah, there are valid ways to use the data. Looking at the parent again perhaps I was misreading it; I was responding to the idea that you could find the correlation and just go straight from there.