I don’t know.
I think there really is a general misunderstanding about what the CV is for, why using it as the sole basis for IDs is bad, and why that behavior degrades the site. People really don’t know.
I think most users want to follow the guidelines, and be positive contributors to iNat. I’m not saying a pop-up nudge would solve the problem completely. But it would at least push people in the right direction.