Basically this gives them legal standing to continue the game.
Sure, the resources and technical expertise are 90% of it.
But the permission from the rights-holder is what'll stop them from just getting summarily take offline on a random whim.
As I'm not privy to the actual agreement, I can't tell if it's just an open ended permission, or if it's time limited "You have X years to do a thing".
Fairly certain it's more of an open-ended "So long as you're not trying to grift, you can keep it going."