Yep, the NSA is on very thin ice right now and they know it. It's the perfect time to stand up to them. Large tech companies can do more than just release statistics. They can take principled stands against these disgusting programs in their entirety.
Executives who are still playing along at this point are just cowards.
The stock market is a fickle thing. Despite the government-collusion revelations, top tech companies' shares haven't moved an inch in response. It stands to reason that share prices would decrease in the event of a revolt against the US Government, one could even take it a step further and argue that -- through a variety of strategically-placed and secretive investments -- the USG holds stocks in these companies.
Through such an arrangement the USG would be able to exert considerable control. One can enter serious conspiracy territory and speculate that the entire recession recently was orchestrated by the USG to launder billions of dollars to gain influence in a variety of companies and property across the world.
Google and Facebook both have dual-class stock structures that make them essentially indifferent to public stock ownership, since their founders have majority voting control. Push the stock price down and the companies take it as an opportunity for stock buybacks.
Executives who are still playing along at this point are just cowards.