Interesting. Are many non-crypto POS services using QR codes? The only time I have come accross it was a loyality program at a local cafe, but that didn't seem to last long for them before they abandoned it.
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A lot of POS system manufacturers are going to tablet-based systems. Revel comes to mind immediately, but there are quite a few of them now. If there is a screen, then QR codes and ads can be displayed to the customer. Tablet-based systems are also much cheaper to buy, and in the long run as well since there are no maintenance costs. If a screen dies, just swap it out for a new one (under $70 typically). NFC equipment however is very expensive to buy, or lease. With NFC, customers are limited on how much they can buy, security is not so good in my opinion, and the fees associated with using NFC services cut into merchants' bottom line bigtime.