You see, if it's fermented grape juice, it's "natural", and so it's a complex flavor profile. But if you actually list out what's in it, it's a lot of toxic chemicals banned as food additives, and synthetic wine is illegal as a result. And you can't omit the egregiously toxic stuff because it makes the test came out wrong.

There was an article several years back about one of these groups trying to get regulatory approval to sell their product, and the stumbling block was the use of things that weren't approved additives. (I want to say it was tannins, since that's the most overtly problematic chemical in wine, but it has been several years since I've seen the article, so I could be mixing it up for one of the other carcinogens involved).

e.g. we're beginning to realize that eating highly processed meats on a regular basis can cause GI problems/cancer in the long run while eating some of the components individually and prepared differently does not.