I have several hockey leagues and pick up sessions that only take payment via Venmo; prior to league or the session starting. Makes it way easier than going around to everybody in the locker room trying to round up cash.

I also use it for a few vendors for some small payments I make every month for my studio.

I don't use them a lot and I know some people that use them for 90-95% of the stuff they do which is crazy to me like yourself. I try and limit my use of the apps to as little as possible. Whatever works for people I guess.

For quite many banks a mobile phone is now the only 2FA they support.

MFA largely, some banks also provide wallets for contactless payments.

I refuse to have my browser fingerprinted as a "trusted device" because part my bank is just bad at it.

Paying for things? Transferring money? What else do you do with a bank account?