I doubt if there is any need to document the range of humans, since that is a worldwide species, present on every continent and throughout most continents and habitats. I also doubt if anyone needs identification assistance with that species. I am trying to understand how observations of humans advance the iNaturalist mission.
I can definitely see potential for abuses here. We rightly allow pictures providing “evidence of” an organism – so a picture of a burrow can be tagged as the species that made the burrow, or a picture of a paw print, as the species that made the paw print. This is as it should be, because this kind of evidence of an organism is valuable. But when it comes to humans, I am envisioning someone uploads a picture of the Manhattan skyline and tags it “human” since cities are evidence of humans.