A short while back iNat curtailed the number of id per obs. When it achieved research grade the “Agree” button was unavailable for further agreements.
There was a big community backlash and the option was reinstated.
There are pro’s and con’s to both arguments. I have no objection to “to many” agreements. It does not affect me in any way. It is research grade, and if someone appreciates my observation and wants to agree, then thanks to them.
I do feel that where multiple incorrect agreements have been made an expert should be able to override them with a valid argument. (A debate for another day)