blacklisting them because they use steemit is censorship. Set you ego aside and look in your heart of hearts... your blacklisting I would guess is going to hurt mostly those that need the extra income to survive.
There are other people that were behind the creation of steemit that are behaving similarly. I was told a couple of days ago by one of that he is "punishing" (my word) anyone using steemit because he had his steem "stolen". In otherwords he is striking out at those who had nothing to do with taking his steem. If you lost steem as well, then you fall in the same catagory. Why punish others for something they did not do to you? Remember when processing use your heart of hearts so you can get a better view of what you do