Not clear what comments here you are taking objection to since they mostly all say essentially the same thing, but here is a more detailed explanation i wrote a while ago with a citation for why observations likely aren’t copyrightable at least in the US.
This topic has also come up multiple times before, and multiple staff members have admitted on the forum that observations themselves probably aren’t copyrightable in the US. For practical purposes the option to apply a license to an observation is basically just a ‘do/do not export to GBIF’ selection box; honestly, it would be clearer to have the box just say that directly, instead of confusing people with license choices that are not meaningful.