Agreed, it is a thing to consider. Problem is (at least in the EU) there's no requirement to put any of the ingredients on the label, other than - I believe - "contains sulfates". It's hard for consumers to know this is really some pseudo-wine.
Yeah. There is also no requirements here in the US because alcohol is regulated by the BATFE (Bureau of Alcohol, Tobacco, Firearms, and Explosives) rather than the FDA (Food and Drug Administration) or USDA (Department of Agriculture). The regulatory scheme here is more about making sure taxes are paid and bootleggers are caught and punished than creating transparency of product or consumer protection.
"Contains sulfites" is awesome label as it is impossible to make wine without it: small amount of sulfites are created as by-product of fermentation.