It's an interesting response because it shows that not only were they tracking program usage over a period of time ("significant number of hours during a multi-week period earlier this year"), but _also_ shows that they quite possibly could have banned people who _weren't_ cheating ("We targeted programs that allow players to cheat and gain unfair gameplay advantages, even if those programs have other, more benign uses."). I use Cheat Engine all the time to mess around in single player games, and quite often leave it running in the background or forget to close it -- that in no way means I'm cheating at other types of games. Further, it's just a memory editor -- unless GW2 is trusting the client where it shouldn't, would it even work on an MMO?