Current regulations (in Europe, and I believe the US is the same) is that only ethanol produced using yeast-based fermentation of crops can be sold for human consumption.
I edited my comment after doing a search. FDA does permit synthetic alcohol in food and food chemical production. It doesn't say that it can't be part of a beverage, which is food. Although there could be other regulations that supercede this.
Very interesting! I did not know that, thank you for sharing.
This explains how Air Company is selling their ethanol as vodka.
Very interested, I didn't know there was a real world example.