NZ expat here :) Venmo doesn't charge for sending or receiving money like this to or from people. They make money through other means; from the top of my head one is paying by credit card - they take 3% if you use credit card. Another way they make money (1% per transfer) is by doing an "instant transfer" directly from your Venmo account to your bank (the other option is ACH transfer which is usually next-day delivery.) I tried this on a Sunday night which was also part of a long weekend and the money instantly appeared in my US bank account and I got a push notification from my bank that a deposit was just made. It was awesome and makes NZ look out of date.
Venmo is amazing. It's so fast and practically everyone has it. It's the Google of payments. I wish New Zealand had something like that. Sending money to friends in NZ is slow and painful - not terribly so, but compared to Venmo they really are.
Venmo mostly.