Steemit is a Blog which uses the BlockChain. Steem is a crypto currency. not the same thing.
I was on Tsu for a while. I never heard of any of the others.
I hear noises about AddBuzz. I went to the site and checked it out...I was underwhelmed. All hat and no cattle.
I guess when there's money to be made people will post clickbait. I think a site has to gain a reputation for quality information. Medium may have that and Wikipedia is generally good as it is heavily curated by volunteers. People will do this for nothing as a service to others and I think that's a different attitude. I still see potential for Steemit to be a good place for artists and writers.