This is similar to competing services on venmo and paypal. I believe they make money on: 1. The "float". The interest that they make from the period that peopl

This is similar to competing services on venmo and paypal. I believe they make money on: 1. The "float". The interest that they make from the period that people have cash in their accounts. If an ACH takes 4 days to complete, they may take 5 days to complete it, and collect a day's worth of interest 2. The halo effect. Now you're a Paypal/venmo/square user, and therefore more accessible to vendors using them as a payment processor. Those vendors pay the service transaction fees.