There is usually no time constraint when filling out an online form. And I'd imagine the physical nature of the in-person alcohol exchange allows the booth operator to evaluate the physical response of the person being asked. All of this is to say, while I understand the idea in physical exchanges, to me the logic breaks down when I can find a completely valid and full address on Google maps in a couple of seconds (assuming one of the reasons they ask for full address is the difficulty in generating at random a valid address that exists).