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I can't find any information on https://rtalabel.org/ to explain why that specific string, but I appreciate that the string being unique made it easy to find the official website, compared to something generic like "adult".

Maybe because it leads people to cease providing non-rated contents, contrary to the intent of regulations.

This btw actually happen: "Sesame Scheme: Unintended Consequences of Allergen Food Labeling"( https://news.ycombinator.com/item?id=44074487 )

I think it should be fairly simple client code to look for either of them.

probably for uniqueness. This code is set by a very specific standard while adult could mean almost anything.