The thing is that even if they manage to shut down one website that's hosting a bot program, they can't stop it from simply resurfacing elsewhere when it's already fallen into the hands of hundreds if not thousands of different players.

All Blizzard actually accomplished with their lawsuit was getting a healthy sum of money because the program they were trying to shut down simply showed up on a new website under a different name.

The only thing actually works to some degree is the enforcement being prompt enough to scare people into not even wanting to bot in the first place.