I am a little bit tired of seeing and telling people that an organism is planted, and they should mark it as cultivated when it is a species widely cultivated in an area, specially when they already identified it correctly (for example Magnolia grandiflora in a street where there are those planted trees, or a Nelumbo nucifera in a botanical garden).
Maybe it could be useful to add a feature that search how many of this species are cultivated in a country or a place (or even the curators could add that option in the specific taxon), and then the app or web could make a question that asks explicitly something like “The identification that you are about to say belongs to a widely cultivated/captive kept species in your area; you think that this could be a cultivated/captive specimen?” and if the person respond “Yes”, the page automatically could mark the observation as captive. This also could be also helpful with the enormous amount of observations of captive cats and dogs, and other domestic animals.
On the other hand some species could have this question as a default; for example Canis familiaris, that is manly found in captivity.
I do not know how difficult could this be to implement and what implications this may have. Let me know what you think