I can't think of much they can do other than pretty much take most major websites and search engines offline. And i dont know if that's even possible, or at least globally possible. But if they get super desperate, it might happen. Imagine no social media at all and no search engines. Only a handful of major companies and people control the whole lot. They could blame it on some sort of cyber terrorism. Basically an online version of what happened at Comet.. give them some time to "clean house" etc.