I'm an engineer at Square, so I can neither confirm or deny such speculation ... but in an interview with Wired, CEO Jack said "People understand credit cards.

I'm an engineer at Square, so I can neither confirm or deny such speculation ... but in an interview with Wired, CEO Jack said "People understand credit cards. They know exactly what to expect from them. They’re used everywhere. But Square is payment-device agnostic. It doesn’t matter how you pay. Some of our users accept only cash." http://www.wired.com/magazine/2011/05/mf_qadorsey/all/1 http://www.wired.com/magazine/2011/05/mf_qadorsey/all/1