This sounds very intersting. But the individuals getting the rebate from the restaurant, they would have to be on steem right? I am slow an not used to these types of programs but what I gather is...
Someone goes to a restaurant, buys a meal, gets a rebate ticket with a steem account thingy, they do a review and get rewarded in crypto? Is that correct?

You are right, the challenges of the the keys and long sign up time will just have them forget about it...unless it is going to be a stand alone app with easy login linked to a steem account. The next thing is, the average joe doesn't want crypto, they want fiat so they know what it is worth at any given time. ( just like the person running the business)

I believe to get people truly using this system, the crypto to fiat exchange has to be instant and or redeemable for some kind of digital gift.... I wouldn't even mention crypto, Just call is Diner gift Points DGP.

I am engaging for discussion, not blasting the idea, it does sound interesting)