There's many occasions where I don't want to drink, but not doing so can make things uncomfortable. It's unfortunate, but there's lots of occasions where abstaining can make other people uncomfortable, or cause them to give you a hard time, or any number of other things. I would love to be able to take something that allows me drink but with none of the side effects, just to avoid potential uncomfortable situations. Again, I'm not condoning the behavior and it's unfortunate that this is how society is sometimes. But it would be nice to have this option.
There's also people who have difficulty controlling their drinking once they start. This would certainly help in those scenarios.
Another example is a situation where a woman may be pregnant so doesn't want to drink, but may not be far enough along that she wants people to know. Not drinking would get people wondering, but drinking could harm the fetus. I don't know if this gel would make drinking safe in that scenario - but if it does, that would be a great situation to use it in.