I honestly don't "get" why someone would use this? It doesn't reverse intoxication, and it doesn't prevent alcohol from entering the bloodstream.
I get that alcoholic drinks taste better than their non-alcoholic counterparts (frozen margaritas are so much better than slush puppies,) but this won't prevent the buzz / intoxication.
Depending on the time of action it could be very useful in addressing the "lag" in alcohol hitting your system. If someone is drinking heavily, they regularly reach an uncomfortable level of intoxication before all the alcohol in their stomach has been absorbed. This could help folks in that situation.
I get that alcoholic drinks taste better than their non-alcoholic counterparts (frozen margaritas are so much better than slush puppies,) but this won't prevent the buzz / intoxication.