I didn't say that to be pedantic, but to avoid that particular type of asker who isn't actually asking a genuine question here. After listing all the ways that Notepad++ (as an example here) suspects who they suspect, the asker then comes back with "Yeah, but how do you know?", as if that's some sort of gotcha. It's disingenuous. Even if the person I replied to isn't attempting this, I find it good to call out and get people to ask a better question: what's the evidence and why does that evidence point to this conclusion?