It's not accomplishing a lot, but it just plays into making it harder to logistically do the grey box imports. You need multiple SIM cards going into your pile

It's not accomplishing a lot, but it just plays into making it harder to logistically do the grey box imports. You need multiple SIM cards going into your pile of devices, you need to have someone in the original market working with you to reliably make that call with every device. This adds friction to the process for someone trying to do it at scale. Just like how needing to register accounts to request the bootloader code can slow them down. Some OEMs even added waiting periods (you'll get your code a week or so after verifying your phone number, and they limit how many requests an account can make). The idea is that eventually it won't be worth modifying greybox devices if there's enough small barriers that annoy the person trying to unlock the device bootloader.