I wish he’d offer DIY flashing. Paying for international shipping back and forth sucks, plus there’s the wait.
It’s quite impossible, once they give out a ROM that can be self flash onto the card. There will be no control of the ROM, and most likely will be widely available on the net in few days.
I also believe the back and forth international shipping is expensive. However, in this case, it’s necessary to protect their work.
Of course, I assume they developed a ROM that can’t be flashed on a normal RX580. And must need to solder a new chip. Otherwise, the ROM will be dumped, and flash onto other cards.
Lots of RX580 has dual ROM design, plenty of guys out there will be willing to try that dumped ROM without worrying to brick their card.
In fact, even the dumped ROM can only provide boot screen, but can’t be function properly in macOS (if flash on a normal RX580), it’s still good enough for most free rider. Because we can flip the switch to get boot screen only under emergency. So simple, and rarely need it anyway.
So, they have to be very careful on how to protect their own work.