For every species on iNaturalist and every place it occurs, one can note their “Establishment Means” with the options being “Unknown”, “Native”, “Endemic”, and “Introduced”. Though tedious, I like adding Establishment Means to the locations that a species occurs because it automatically lists the Places on their taxon page. (Unfortunately, simply making an Atlas or adding a species to a Checklist does not list the Place on the taxon page - it needs Establishment Means to be listed.) I also feel that that information should be accurate, especially since you can search for taxa when viewing them via Places by whether or not they are introduced, endemic, etc. (for example, (check out what species are endemic to Brazil).
However, it is impossible to set species as “endemic” to continents on iNaturalist. @loarie does not remember why the devs made this the case, but he noted that countries do not necessarily nest within continents in the same way counties/states/provinces nest within counties, and I agree with him. The Hawaiian Goose may be endemic to Hawaii, but it arguably isn’t endemic to North America since Hawaii is a Polynesian archipelago much closer to Oceania than North America. However, I don’t think this is a catch-all problem. For example, the American Black Bear absolutely is endemic to North America. And for species like the Platypus - which is endemic to a country (Australia) that is objectively nested within a continent (Oceania), but cannot be marked as so - marking it as endemic to a continent should not be a contested issue.
I would like to have users (or at least curators) be able to mark species as “endemic” to a continent, or at the very least receive context as to why we currently are not allowed to.