Well…yeah. Sometimes people DO upload pictures of human artifacts (artwork, litter, buildings, cars, etc). “Human” gives us a legitimate ID for them while also removing them from the potential RG pool (Human observations are ALWAYS casual), so they don’t go to GBIF.
iNaturalist’s mission is to connect people with nature, as @schoenitz stated. I think that part of that is allowing some “ambassador species” like humans, houseplants and pets (tagged appropriately as captive/cultivated, of course) onto the platform, under their appropriate taxonomy on the tree of life.