iNaturalist follows FishBase for fish taxonomy, with deviations as the community requests/decides. As of 2018 at least 1) D. abdudafur still wasn’t included in FishBase, 2) iNaturalist intentionally does not attempt to follow the primary literature for most taxa for the reasons listed here, and 3) no one had requested it be added as far as I can find. So please (everyone) feel free to flag taxa for curation when something appears outdated or out-of-line. There is also a huge backlog of taxon flags, so if anyone reading this might want to become a curator to help out, there’s more info here: https://www.inaturalist.org/pages/curator+guide
Not that I’m aware of, but the request is here: https://forum.inaturalist.org/t/implement-standard-marine-places-for-the-worlds-oceans/1458

the ubiquitous Humbug Damselfish (Dascyllus aruanus) was split so that all Indian Ocean specimens are now D. abudafur
Continuing the discussion here: https://www.inaturalist.org/flags/418232