As a computer security researcher, Steve Manzuik says he's "a little more paranoid" than the average person when it comes to his credit and debit cards. He's familiar enough with ATM skimmers — devices that mimic an ATM's card reader to swipe card data — to say he could probably make one, if he desired.
A technology is called “disruptive” if it creates a new market that first disturbs and then displaces an earlier technology. Bitcoin is potentially such a technology and much more.
Some people don’t see the point in using bitcoin, especially not when cash is readily available. While it is true cash transactions allow consumers to remain somewhat anonymous, it isn’t a perfect financial tool by any means There are quite a few reasons why people would use bitcoin rather than cash, although some of these “practices” may be considered controversial.