The cynic in me notes that the companies were spurred into action by the leak. Google has always showed some interest in providing transparency about government

The cynic in me notes that the companies were spurred into action by the leak. Google has always showed some interest in providing transparency about government requests, but even they were not taking the US government to court over it. The companies involved are taking these actions because the leak may have undermined consumer trust (eg. small drops in activity) in them. Perhaps even wrongly, if PRISM isn't as widespread as the initial leak suggested.