Uruguay doesn’t let people naturalize the same way as Argentina does. You become sort of a permanent resident but keep your birth’s nationality. I don’t know why this should be of any interest to this forum.
I too have the same impression that some people are trying to hide their multiple nationalities based on the forum’s posts.
I don’t know the reason why. It seems that some are trying to hide their multiple nationalities - for tax purposes? Genuine question question.

Citizenship is a culture-based concept whereas nationality is a political and bureaucratic definition. Some posters seems to swings between definition based on their own’s interests that are not clearly stated in their posts.