Curiousity about RFID

This video makes me want to learn more about RFID. (Update. I posted a video about Pablos who knows exactly why. The post is here https://www.carmelowalsh.com/2014/03/pablos-holman-hacking-rfid-credit-cards/)

Perhaps it is a case of security through obscurity? You might be able to rig a badge reader off of ebay to work with arduino, as this article suggests.