so you say that it's mostly a result of these people's default scanner settings or something along these lines?
Stuff like that, yeah. For instance, I've shot a lot of Superia 200 and it's not inherently bluish/greenish, nor particularly muted. It's a moderately saturated film and quite neutral in how it records colors. This is when it's printed optically on RA4 paper. Scanned and digitally post processed, you can make it look any way you want, of course.
Is either one of these versions "more true" than the other? I really don't know. It's evidently the same frame. Coincidentally, it's Superia 200. I've never optically printed this particular frame, but I'm pretty sure it would end up looking more like the one on the left, although probably with even a little more punch, on a modern paper like Fuji DPII. But that's in part because (1) color paper is pretty saturated and contrasty to begin with and (2) I tend to balance a bit more to the warm side usually because I happen to like it.
I'd suggest that if all of someone's shots come out greenish/bluish and with low saturation, it might be worthwhile to look into how the film is being processed - with an emphasis on the digital part of the processing; i.e. color grading. Unless they
like their results to be consistently greenish/bluish and with low saturation, in which case it's evidently best to just hope the magic doesn't somehow fade away.
The only thing that comes out *really* green by definition is ECN2 film like Kodak Vision3 optically printed onto RA4 paper. But this very (very!) strong green cast can quite easily be filtered away, leaving a perfectly neutral print. Mind you, this is an extreme case, and even this 'pans out' eventually.
All this makes me very, very skeptical about
most (not all) claims online where people state with much confidence that X or Y film looks "very green" etc.