Sure you can block users for any reason. Internet is free for all and you can do anything on your own machine. But if you are smaller than a major newspaper fro

Sure you can block users for any reason. Internet is free for all and you can do anything on your own machine. But if you are smaller than a major newspaper from G7 country - you will just disappear if you do that. Almost nobody on the Internet produces irreplaceable content (!= unique content).