I think the thing to keep in mind is that iNatters photograph for many different reasons, a lot being opportunistic. iNatters may not post a complete list of what they see, perhaps because they are unable to get an image/sound of what they saw which is the requirement for an iNaturalist observation.
For example, I do not know birds, so I am not selective in what I photograph. If I capture an image or sound of a bird, then it is posted as an observation. I not sure that I’ve even posted a rare bird image - maybe I have, I don’t know.
Edit - just checked and found I do have a couple of rare ones from the Coorong, South Australia.