This actually makes sense. Alcohol regulation is extremely complex due to the prohibition era. I imagine it's a nightmare to try to legally advertise alcohol over a interstate medium like SMS.

This regulational complexity is the same reason why major shippers (FedEx, UPS) generally don't ship alcohol without a special agreement. Spirits, wine, and beer can all be different, by state and even by county. This is why there are special alcohol distributors that specifically deliver and stock alcohol.