You entered an agreement when you got a bank account in the first place...
These payment apps tend to work like another bank account in practice.
People use P2P apps when they want to casually send money to people they know. For merchants they get the square app and process credit cards directly. Venmo & friends tend not to be good for actual business for large transactions due to how bad chargebacks can be on it, so for large transactions you can use ACH which tends to be $0.25 for pretty much any money value, or free in many cases.
