The people in ‘power’ do not call it that way, but Sadowbanning/blocking is indeed happening sometimes on steemit (not on the steem blockchain). I even have one “true example” for you. Remember, About half a year ago, when that hackergroup (the dark overlord) came out on social media, and demended to be paid in btc for the real truth about what happened at 911???

Well, .... Those guys & girls also posted on steemit, and they got kicked off, blocked/ shadowbanned of steemit, but you could still find their posts on the steem blockchain.

I remember @aggroed wrote a mad post about it, concluding that ...

“The steem blockchain is censorship proof
the steemit.com interface is not
the steemit blockchain isn't a thing that exists“

https://steemit.com/steem/@aggroed/a-note-about-thedarkoverlord-and-censorship-on-steem-it