He bought a Quick Charge power bank ... a Digispark board and he set about hacking it. He isolated the VUSB from the rest of his board since it would get pulled up to 12V when in use.
Plus, it will mean packing in adaptors for those with older power supplies, as the new 12V-2x6 connectors and ATX 3.1 PSU standard are still relatively new. If AMD were to stick with traditional ...