Can the FBI lock you out of signing up at media sites like CNN, Politico, Daily Caller, and Infowars?

You are correct. We loose our freedom all the time by censorship. The media shows us what the government says. You do not have access to all of the sites on the internet. That is not because you did not sign up for or pay for them. This has been a trend and it is just as much about profit as it is freedom. If I eliminate your other choices you will go with me for services or product. Money can protect anyone. Someone sold out Saddam Hussein, and got a pretty penny for it too. I see you have posted in many places, good job. If nothing else works bring it to the people (You can fool all the people some of the time, and some of the people all the time, but you cannot fool all the people all the time.)