I believe it is fairly common in the US for victors to be awarded money to cover their legal fees. The problem is that none of these companies being sued are confidant they would win, and they don't have the money to cover losing.
I think the other part of that problem is that, even if they could be guaranteed to win and have their costs paid, the whole process could take a very long time, and they have to be able to pay all those costs in the meantime.
