I would guess that in the game of spy vs. spy, you never show your hand. If I declare that a chip has a backdoor, then the enemy knows, and won't use it. New

I would guess that in the game of spy vs. spy, you never show your hand. If I declare that a chip has a backdoor, then the enemy knows, and won't use it. New chips and doors will be created. But if I sit on it, then the bad guys may try something, and you can intercept it, or defend against it, or even exploit it yourself.