With my Rev1.3 board it doesn’t work to power it via a TB3 cable from the USB-C port of a MacBook since the board ends up in a boot loop. No idea how much amperage the MacBook delivers and about state of CC pins. In the pre USB-C days my MacBooks provided 1100mA at the USB3-A ports but with USB-C this might have changed (same might apply to iPads as well).
BS. Read any of the available reviews that report power requirements or just look here at this experiment powering Rock 5B with crappy consumer NVMe SSD in M.2 slot and powered by a dumb 10W USB-A brick.