Nah, they still taste like grape and sugary. It wouldn’t ferment without sugar after all.

Nah. They're smaller, usually sweeter and have big seeds. I actually prefer the taste of wine grapes, even though they're harder to eat. Just has a few over the weekend. Also the wines that retain the seed or grape skin aroma taste great.

Anyway, wine is about at least 3x more expensive than grape juice so it's better ROI to sell good wine. They could make alcohol free wines, but in my experience everything I've tried sucks, just like alcohol free beer.

You're right that some are way too acidic and astringent. Usually the kind that you'd age for longer and have more complexity would make poor juice but excellent wines.

There are plenty of varieties of grapes that do well as juice and wine. It's just the type of wine that you'd age very little because it would lose the acidity and temperament too quickly if aged.

I have never had grapes that tasted better than wine grapes in Georgia (the country). Like a juicy caramel.