The lawyers may very well not take any money but that's not what you need the money for.
For a case like this with 100,000's of documents tons of witnesses and experts you need more money just for the discovery phase that any non-tv law firm will be able to put out.
The defense also needs to be able to bring their own experts which in this case might be psychologists, social liberty experts, computer security and forensic experts, anti-terror and national defense experts and more, all of those cost money and a lot of it even if they are willing to come out and testify at cost.
For a case like this with 100,000's of documents tons of witnesses and experts you need more money just for the discovery phase that any non-tv law firm will be able to put out.
The defense also needs to be able to bring their own experts which in this case might be psychologists, social liberty experts, computer security and forensic experts, anti-terror and national defense experts and more, all of those cost money and a lot of it even if they are willing to come out and testify at cost.