McD's: Deer in headlights, multiple languages, fewer employee interactions, speed increase (more units sold per hour)...

The stadium: They make money on the cash/prepaid machines just like coinstar. You give a $20 bill and get $18 loaded on the card. Plus less cash handling (short drawers, mis-counts) plus security needs for all the cash....

China has gone not only cash free, but card free. Almost all transactions are done via phone app. Europe is mostly cash free, and big companies are multinational and need to bring everything in line..