Well guys that the way of the future and valve was the first to pioneer it. Figures, if they know your willing to spend money to cheat, then they know it's easy to stop you from cheating by simply taking every game you have bought and rendering all the stats and achievements with it useless. Then, like most rational people with that bit of knowledge won't try to cheat because then they could lose possibly hundreds and in the future, thousands of dollars worth of games and the corresponding large amount of time sunk into it. It's why all of the big game publishers are doing this, just look at EA now with its Persona program. Since PB has been really good at detecting de.bugs work on BC2 a lot of people have lost a lot of money trying to hack this game and eventually, EA knows, they'll stop paying money trying to buy keys for new accounts that get banned and that spreads the word around that if you hack this game you will get caught and you could lose all of your games on the account. That's why everyone is doing game accounts tying in anti-cheats with the service or as a requirement to gain ranks/points/achievements so that way if you want to hack is literally at your own peril or money or time.