What if, as someone said earlier, someone brought in a speaker and just played a recording of them shouting "Bitcoin" over and over?
I meant how would the customers get their faucet payment?
answer-1) People wouldn't be allowed to use speakers to reproduce/faking a voice. That would be one of the rules. And you could report/alert for abuse so that this user was warned and if necessary denied access and blocked.
answer-2) Maybe you would have to be registered on the website of that business. Once registered you could set/edit your bitcoin address to receive funds. It would also give you the password to access the building/shop. Every hour you would have to come out of the building/shop and enter your password to see if you were still allowed to enter that place.