content: All the app does is connect a method to pay to an individual. After that the app is completely unnecessary. If they're hacked then I expect they'd patch the vulnerability, learn from their mistakes, and move on. Not exactly a big deal. Success here, which now seems like a given, will change the world. And not even just about completely eliminating cashiers and checkouts, but think about bigger picture. It is tracking, with effectively perfect precision, per person interaction with arbitrary objects in an arbitrary space. Lots of really cool technological possibilities there, along with more than a few dystopic possibilities as well.