If cash dies selling your surf-board to your friend at the gym will be done using your card or a mobile payment. Does this mean that like Paypal those transacti

If cash dies selling your surf-board to your friend at the gym will be done using your card or a mobile payment. Does this mean that like Paypal those transactions will be monitored, controlled. Does this mean one-day they might occur a tax? Will our constant need to simply everything we do make our lives more controlled and ultimately more expensive?