Well you usually don't communicate to it through USB. Keep in mind this is not a microcontroller with simple UART port, it's a full-on computer. When do you ever connect two computers to each other with a USB cable to transfer data?
You'd usually use SSH & SCP, or potentially even use a NAS to sync data between devices on the same network. Same thing with an Orange Pi.

Anyhow, you should be able to power it through a PC USB for initial setup, but once you start hitting it with services, initial blockchain download and similar, you want it to be on its own PSU.