When ATMs first came out, they provided a significant competitive advantage because they helped banks to differentiate themselves from others. Today, almost all banks provide access to these, so it is considered to be a standard service. RBX bank is adding a functionality to ATMs where a customer could do the majority of the transaction on the RBX mobile app, then completing a cash withdrawal by tapping their phone to the ATM. Identify which of Porter's Five Forces this functionality is using to gain competitive advantage and describe why it creates this advantage.

How could you reengineer a bank's ATM system in order to gain another competitive advantage?