I think the devs just didn’t had time to work out on the legal means for that. If you delve a little on Sirrian’s messages you will find this:
So at some point Redeem codes maybe were sort of a low priority since they had to remove it all from PC/Steam/Mobile and PS4, while in the meantime they already had their hands full with the Console Updates and catch-up as well as the recent issues with servers migration…
Right now the plea for Redeem Codes for consoles might, still, face a barrier… I can only assume that the game is in need of a few tweaks, and an update that usually takes quite some time to be approved, to make it all work with the overpresent bureaucracy of those plataforms.