The EOMM (aka SBMM) is beyond any developer now - it's definitely written and implemented by a specialist uncredited third party team off the back of Activision's concept patents and I'd say its even past Demonware's pay grades as they are more services-based. It's definitely gaming's closest guarded secret right now and although developers know roughly how it functions as a concept (i.e drive engagement and milk the community via willing payees) they probably don't know the precise true functionality or wont speculate because deep down they know just like FIFA, there is artificial manipulations in play that would severely damage the game.
They'd be better off just coming clean because it wont make a blind bit of difference. FIFA had corrupt scripting for years that exists within EAFC and it didn't impact the playerbase and the amount of reverse-boosters and cronus cheaters plaguing COD, it hardly matters. The best thing that can happen is Microsoft weed out all the horrible psychological and manipulative crap from these games and just keep it simple like Counter Strike.