I know in my state NA beer is still considered to be beer. Have to be 21 to purchase, need a liquor license to sell it, etc.

As I recall it’s because the definition of beer in the state statute defines beer as a fermented drink with certain criteria like wheat, barley, hops, etc. as ingredients, and alcohol content not being one of the criteria.

It actually meant a local sober bar (a bar-like place that only serves NA drinks) had to go through the hassle and expense of getting a liquor license.

I think they used to wax the cardboard. Maybe they still do?