Just the sight of an screen at a coffee shop counter is enough to make most Americans grumble. In recent years the Apple devices have become synonymous withwhich has seen tipping culture spill out from bars and restaurants and into stores, takeout chains and even self-service machines. But there is one man who is surely not complaining. Billionaire 's tech firm Square - which sells the software that powers many of these iPad payments - made an eye-watering $3 billion profit last year alone.
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