It's not like they intended that to happen. Deej said it best last week, 1000 testers can look for any crack in the game but nothing can compete with the ocean of millions who play. They actually sat back and thought "I wonder if they'll find out about the secret mission" when they released the Black Spindle mission, and what happened? Within hours someone accidentally falls into it. They are aware, and they are working on it. They do keep track of everything that goes on in Destiny so it's possible that exploiters will be penalized, but as someone who bought it, I don't think they should.