https://forum.inaturalist.org/t/community-versus-observation-taxon/4426
As for reasons why somebody may opt out – it’s because it’s ultimately the observer’s observation, and they have final say. I can imagine reasons for opting out but that doesn’t matter. If the observer wants to identify a house sparrow as a green alga, that is their prerogative, and ultimately OK. What is not OK in my opinion is to solicit community input for this by tagging it ‘needs-id’.