your game play, activities and usage of games and Xbox Services will be tracked and shared with applicable third-parties, including game developers
I'd be less concerned if they committed to sharing data about a game's use ONLY with the publisher of said game, via an opt-in mechanism (or at least gave you a global opt-out option).
But the ambiguous way this is worded leaves the door open to them sharing whatever they want with whoever they want. No thank you, bugger off.