[jerf]

I don't know what those four state's goals are, but if they are out to address the nominal issue and not just collect a payday in court from deep pockets, they are correct to not sue all of them all at once. In our system, they want a precedent. To get that precedent, they go after their best target to get it. I would expect they looked at all the possible targets and determined that Facebook is the one they are most likely to win.

They have to make this determination before discovery, but that's life.

If they win this case, even if they don't get the full penalty, you can be sure the other companies will be paying attention and will do something about it. Of course that "something" may not be "immediately stop engineering addiction into their products" and be more like "be sure to obfuscate it better, maybe crank the knob down a bit and prepare to claim in a future lawsuit that the problem was solved even though they haven't really changed anything". Suing the next company is easier with a precedent to go off of.

They are correct to concentrate their fire on what they believe is the most vulnerable part of the line, not to spread their limited resources out over attacking half-a-dozen of the largest and most well-resourced targets on Earth. Once they lose the first case, the resulting precedent weakens them in all of the others as well.