Which doesn't mean anything in regard of win or loss....
Remember the old lady who sued MickyD for 1 mio and won. Because she spilled a cup of coffee in her lap..
This case here might look silly at the first glance. But at a closer look.. They may actually have a case. Not so much for themselves here, but to force Blizzard to make their products safer. One can do just so much to protect themselves from harm. There is no 100% guarantee though.
Besides, I don't have knowledge of the trade laws in place. So I really cannot judge to what extent the lawsuit is frivolous..
One thing I do know, that lets say a car manufacturer doesn't sell you a car, and then charges you extra for the key to lock it.
This may be stretching it, but it seems that's the direction they are aiming at.