Apple can revoke it at any time. If a future update disabled or changed iBoot, there is no guarantee Linux would ever run again (unlike UEFI Macs). Valve is no

Apple can revoke it at any time. If a future update disabled or changed iBoot, there is no guarantee Linux would ever run again (unlike UEFI Macs). Valve is not like Apple, they treat UEFI as a default.