I agree with spiphany. iNaturalist is the only place that I am familiar with that has this “total erasure” policy.
PS: The ‘reduce clutter’ theory is unconvincing. People are allowed to comment about everything, why would a tag inviting another user to have a look be so terrible? Has it occurred to the erasers that newer member might learn who is who and who is a good person to tag for this kind of organism? Removing comments with summoning tags is curtailing the usefulness of iNaturalist and runs counter to its mission.