I haven't heard anything like that either, the closest thing I have heard are simgurus muting people on twitter, which I don't think it's odd at all because those people probably replied to the simgurus tweets with responses that they didn't felt like they wanted to deal with. Twitter can be pretty toxic sometimes.
In my experience, companies don't care if you are little bit negative, even if you say that the game is bad you are still talking about the game and creating publicity. If people have somewhere to talk about things that they find annoying too they often don't take those words into action, they complain, and then they go back and play the game. If they don't have any platform to do that they tend to take those words into action and stop playing, which is bad for business.
So I don't think EA would bother with banning accounts unless you have broken their terms of service or something.
