The only way for Blizzard to know what they are up against is of course to have bots running 24/4 to see how many get caught, after how long, and what triggered the system. They can't afford to have a whole team looking into it, luckily for us, but they sure have at least one programmer who is, hopefully not full-time, watching sites like this one and running bots the whole time.
If you were Blizzard, what would you look for?
If you were Blizzard, what would you look for?