This project seems good overall. But,
"If you own a restaurant you can make a menu app that knows which table and seat somebody is in. customize their order. Pay for it with steem and pay no fees anywhere. They can leave a review directly on your app using the blockchain again as a database. Now your user can even be paid for writing the review."
:D
Do you think all people come to restaurant are holding steem or a member of steem community?
Be more practical when giving examples.
The information posted is public, I except nearly every person patronizing anything will have a cell phone. While they might not be able to purchase with steem they will be able to see a menu, you can put any online payment method along side steem. The software doesn't need to only be POS, even just games while you wait for food paid for with cash is a network patron. Therefore, everybody who uses software distributed like this gets to interact with steem, making the platform more desirable.