It seems fairy obvious to me that the simple solution here is for Apple simply send a cease-and-desist to Beeper to stop using their network in an unauthorized

It seems fairy obvious to me that the simple solution here is for Apple simply send a cease-and-desist to Beeper to stop using their network in an unauthorized manner (and I mean that in the literal sense of “you don’t have permission to do this”) The only reason I can think of that Apple is willing to let this go on is to plug holes in their system shown by a relatively benign opponent.